Download Energy HD APP Teacher - Moore Public Schools

Pre-notes across the bottom of home screen:
Energy makes all movement and change possible. It exists in many forms. Your
body gives off heat energy. Land and the oceans are warmed by solar energy. Electrical
energy flows through wires.
This app explores several forms of energy with videos and fun facts. We will
explore the major types of energy: potential energy and kinetic energy.
Potential energy is stored energy that is ready to use. Kinetic energy is energy of
motion. It is not just ready; it’s already on the move.
We will also look at energy transformation or energy change. Energy is never
destroyed, but it can change form. For example, electrical energy that enters a
television is changed into sound, light, and heat energy.
Open the EnergyHD app
Select Potential EnergySelect Read and Learn: Read through all of the information.
Did you KNOW: (Scroll through and read the facts at the bottom of the screen.)
Tap the left arrow at the top of the screen.
Select Touch and Learn Fill in the blanks and answer the questions as you cycle through the information.
Conversion of potential energy to kinetic energy:
Touch the glowing spots on the left silver ball that is pulled away from the rest.
Named after Sir Isaac Newton, the (1)______Newton’s Cradle ____demonstrates the Law of Conservation of
Energy and Momentum. Energy is converted from potential energy to kinetic energy and vice
versa, but the total energy remains the (2)____same______.The device consists of a series of pendulums (5-7
steel balls suspended by a wire) that line up in a row. When one of the balls at the end is
pulled away, it (3) __gains___ gravitational potential energy. This potential energy is converted into kinetic
energy when it is released. As the end ball strikes the other balls, it transfers the
(4)____momentum___________ to the other balls and finally to the ball at the opposite end.
As the end ball at the opposite side swings, its
(6)_____potential______ energy.
(5)___kinetic____ energy is converted to
Tap the screen outside of the info box. Touch the glowing spot between the third and fourth silver ball.
Watch the video.
(7)Describe what happens in the video.
One ball is pulled back and it runs into the other balls. the other end ball goes up. then swings back then two
push three then at the end both end balls swing into the other hanging balls causing different numbers of
them to move.
Slide your finger left to right to advance to the next screen.
Water behind a dam has an immense (8)______gravitational_________ potential energy.
Touch the blinking yellow dot on the left side of the screen.
Water behind a dam has a lot of potential energy. Both the (9) ____volume______ of the
water and the (10) __height_____ difference (or the head) between where the water enters and leaves the
dam, determine the power that can be extracted from the water.
Touch the screen to exit the popup window. Touch the blinking yellow dot just left of the center of the
screen.
When the water is held behind a dam is released, the (11) ___force____ of the water
drives the (12)___blades____ of a turbine, which is connected to a generator
that produces electricity. The water is then released into the river on the other side of the dam.
Ignore the blinking yellow dot near the bottom left of the screen. You can’t watch the video.—The video
does not exist.
Slide your finger left to right to advance to the next screen.
A battery has (13)____chemical____ potential energy.
Touch the yellow dot near the center of the screen.
Batteries store chemical energy and convert it into electricity when connected to a
(14)___circuit______. A battery is made up of multiple electrochemical cells or galvanic cells. Each
electrochemical cell has a positive terminal called a (15)____cathode_____,
a negative terminal called the (16)________anode______, and the medium or the electrolyte. When
connected to a circuit, chemical reactions occur at both the anode and the cathode that
(17)___convert___ chemical energy into electrical energy.
Touch the screen to exit the popup. Touch the blinking yellow dot on the left side of the screen. Watch the
video
(18) Who invented the battery? Alesandro Volta
(19) What do batteries need to work? A flow of electrons from high concentration to low
concentration.
(20) What is the source of the current? the two types of metals zinc and copper
(21) What is the flow of electrons called? electrical current
(22) Why does the frog’s leg jump? Electrons flow from the zinc through the frog’s leg and into the
copper. The nerve in the frog’s muscle is sensitive to electricity.
Touch the screen to exit the popup. Slide your finger left to right to advance to the next screen.
Wood has (23)___stored_____ chemical energy
Touch the blinking yellow dot on bottom left side of the screen.
Potential energy is stored energy. Potential chemical energy is stored in the
(24) __Chemical bonds__. The most common examples of chemical energy include fuels, food, wood, natural
gas, etc.
Chemical energy is released as (25)__light____ or (26) ___heat____ when atoms or molecules combine or
break apart.
Chemical reactions that release energy are called (27)____exothermic________,
while ones that absorb energy
are called (28)______endothermic________.
Touch the screen to exit the popup. Touch the blinking yellow dot on the right side of the screen.
When wood is burned, the chemical energy in the wood is converted to (29)______heat_____.
Chemical potential energy is ready to be released in a chemical reaction. The energy could be released when
atoms and molecules (30) ____combine_____ or when they
(31) ___break apart____. If atoms or molecules combine, the chemical energy is
stored in the bonds that make up the (32) ___molecules_____. If atoms
or molecules break apart, then the chemical energy is released as heat and light.
Slide your finger left to right to advance to the next screen.
Food contains stored (33)_____chemical_____ energy.
Touch the blinking yellow dot on the left side of the screen.
Another form of potential chemical energy is in the food we eat. The amount of energy in the food varies
depending on the type of food.
The energy stored in food is measured in (34)_____Calories__________. One calorie
is the amount of heat or energy required to raise the temperature of one gram of water by one degree Celsius.
The chemical energy stored in the food is used by (35)____animals_______ for a wide range of functions that
include providing energy for the brain and muscles, maintaining body temperature, and providing energy for
growing and reproducing.
Touch the screen to exit the popup. Touch the blinking yellow dot on the right side of the screen. Watch the
video.
(36) Which food type had the most energy? Why? Cheese puffs had more energy because they had
more calories and oil.
Touch the screen to exit the popup. Tap the left arrow at the top of the screen.
Select See and Learn
Tap the left arrow at the top of the screen.
Select Watch and Learn. Watch each video and answer the questions. Use your earbuds if in class please.
*Solar Radiation and the Sun’s Path Chapter 1 (4:47)
Home consumes energy in many ways: What percent of consumed energy is used on each of the
following:
(1) cooling and heating of space____38%____
(2) water heating_____13%______
(3) Lighting ____9%_____
(4) What changes the amount of solar energy gained through the seasons? Solar altitude angle
(5) What is the name for the angle related to the southerly direction of solar energy called? Azimuth
*How Geothermal Energy Works (4:54)
(6) Where are the hottest granites on Earth at reasonable drilling depth? Cooper Basin in Australia
*Introduction to Wind Power
(7) What where the first windmills produced to do? Pumping water.
(8) When did large wind farms first appear and wind produced energy become commercially
available? late 1990’s
(9) What are the parts of a wind turbine? Rotor blades, Nacelle, Tower
*Lightning Science from the University of Arizona (5:35)
(10) What are the two types of lightning? cloud to ground, cloud to cloud
(11) Describe why/how lightning works. positive and negative electrical charge build up and separate,
release of negative electrical discharges
(12) How hot is the heat energy of the return stroke? 50,000 degrees Fahrenheit
(13) What kind of lightning flashes tend to have a greater probability for starting fires and damaging
electrical power lines? positive charge lightning
*Where Energy Comes From (3:52)
(14) What are the three types of fossil fuels produced from organic remains of prehistoric
plants and animals? coal, oil and natural gas
(15) What type of charge does the nucleus have? positive
(16) What type of charge do electrons have? negative
(17) What is the flow of electrons called? electricity
(18) Name three kinds of renewable, cleaner energy forms. wind power, hydro power, solar power
*Kinetic & Potential Energy (4:07)
(19) What type of energy did the rock have when it was falling? Kinetic energy
(20) True or False. The faster moving rock has less kinetic energy than the slower moving rock.
*Potential Energy: Wile E. Coyote & Roadrunner (1:22)
(21) The elastic potential of the torsional spring in the giant mouse trap had ____potential___
energy that was converted to ___kinetic____ energy. potential, kinetic
(22)The elastic potential of the compressional spring converted to kinetic energy that converted to
_____gravitational______ potential energy that converted to kinetic energy.
*Physics: Kinetic and Potential Energy in a Roll (1:47)
(23) The basic underlying principals start with what? The Law of Conservation of Energy
(24) The ability to do work is called what? energy
(25) Moving something with force through a distance is known as what? work
*DNA Animations: What is Potential Energy? (:30)
(26) Stored energy is called what? potential energy
(27) True or False.
To build potential energy you can raise an object against gravity.
Tap the left arrow at the top of the screen.
Select Quiz and Learn
Potential Energy
1. Which could cause energy to appear as light?
A. atoms combining
B. molecules combining
C. molecules breaking apart
D. all of the above
2. Which of the following is most responsible for movement?
A. energy
B. molecules
C. chemicals
D. scientists don’t know
3. According to the lesson, what type of energy does your
body produce?
A. light
B. heat
C. nuclear
D. all of the above
4. Which of the following is true?
A. Energy cannot be stored.
B. Kinetic energy is stored energy.
C. Potential energy is stored energy.
D. None of the above.
5. What are the two main types of energy mentioned in the
lesson?
A. chemical and nuclear
B. potential and kinetic
C. light and heat
D. mechanical and elastic
6. Which type of energy relies most heavily on an object’s
position?
A. chemical
B. gravitational
C. nuclear
D. electrical
7. Which of the following is true?
A. Most objects do not contain potential energy.
B. Without burning fossil fuels, we could never meet
energy demands.
C. Enough solar energy is available to power all
current human activities.
D. Water is an outdated source of power.
8. How is chemical energy similar to nuclear energy?
A. They are both examples of gravitational energy.
B. They are both examples of mechanical energy.
C. They both happen when bonds break or form.
D. They are both risk-free sources of power.
9. Why is it more dangerous to drop a stone from higher up?
A. Chemical reactions are more powerful in a thin
atmosphere.
B. Nuclear reactions are more powerful with height.
C. Energy increases with speed.
D. All of the above.
10. How is kinetic energy different from potential energy?
A. Only kinetic energy can be stored.
B. Kinetic energy is in motion.
C. Kinetic energy can be destroyed.
D. Only kinetic energy can be increased.
11. Your teacher is about to dive off of a board. How could
your teacher make a more powerful splash?
A. Stand on a lower board.
B. Stand on a higher board.
C. Wear heavy clothes.
D. Both stand on higher a board and wear heavy
clothes.
12. If two objects have the same mass, what could explain
their different potentials for energy?
A. different lengths
B. different heights
C. different lengths and heights
D. none, they both have the same potential.
13. Which object has greater potential energy?
A. a rubber band resting on the ground
B. a hunting bow resting on the ground
C. a rubber band that is stretched
D. a rubber band that is not stretched
14. Gravity is weaker on the Moon than on Earth. If cats
were astronauts, how would their potential energy change
on the moon?
A. The cat’s potential energy would not change.
B. The cat’s weights must be known.
C. Cats would have more potential energy on the
Moon than on the Earth.
D. Cats would have less potential energy on the
Moon than on Earth.
15. If you bounced a ball, at what point would it have more
potential energy?
A. before it left your hands
B. immediately after leaving your hands
C. when it hit the ground
D. when it started to bounce up from the ground.
Select the back button twice to the home page. Select Kinetic Energy.
Select Read and Learn Read through all of the information.
Did you KNOW: (Scroll through and read the facts at the bottom of the screen.)
Tap the left arrow at the top of the screen. Select Touch and Learn Fill in the blanks and answer the questions
as you cycle through the information.
A swing has both kinetic and potential energy.
Touch the blinking yellow dot on the center of the screen. Press play on the video.
Pulling the bowling ball back from the middle, it gave it potential energy. When we let go of it, it had kinetic
energy. The kinetic energy will (1)___never_______be bigger than the potential energy. It’s
only going to have as much energy as we gave it. Energy can be changed from one form to another.
Electricity is a form of energy. A lot of it comes from the heat released from burning (2)___coal_____.
Slide your finger left to right to advance to the next screen.
A moving car has kinetic energy.
Touch the blinking yellow dot on the center of the screen.
Kinetic energy is the energy of motion. The word “kinetic” comes from the Greek word for kinesis, which means
“motion.” Kinetic energy is calculated by multiplying half of an object’s mass by its velocity squared.
So in the case of a car, its kinetic energy is half of the mass of the car (approx.2000-3000 pounds depending on
the size of the car) times the velocity of the car squared. Did you know that the EPA (Environmental Protection
Agency) estimates that for every 100 pounds taken off of a vehicle, its fuel economy is
(3)__increased____ by 1-2 percent?
Touch the screen to exit the popup. Touch the blinking yellow dot on the left side of the screen.
Just like human bodies need air, water, and food, cars need gasoline, electricity, and air. Inside a gasoline engine
(an internal combustion engine), the right amount of fuel and air are mixed and ignited by a
(4)___spark____. These controlled explosions inside the engine block generate power.
This pushes the piston which turns the crankshaft and driveshaft to deliver power to the wheels. Thus, the
chemical energy in the fuel is converted to mechanical kinetic energy.
Slide your finger left to right to advance to the next screen. Flowing water has kinetic energy.
Touch the blinking yellow dot on the left side of the screen.
A fire hydrant is a source of water is used by firefighters to extinguish a fire. Before the invention of the fire
hydrant by George Smith in 1817, some cities had (5)___bucket___ brigades. These
were a group of volunteer firefighters who would carry buckets of water from the water source to the site of the
fire.
Touch the screen to exit the popup. Touch the blinking yellow dot just right of the center of the screen.
When water is not moving, it has (6)____potential______ energy. This potential energy causes static pressure to
build up in a system. When a firefighter opens a hydrant, some of the potential energy of
the water that is not moving is converted into kinetic energy of the moving water. Some of the potential energy is
used to overcome friction in the pipe and the rest is converted into kinetic energy.
Slide your finger left to right to advance to the next screen.
A bicycle (7)____brake____ converts kinetic energy to thermal energy.
Touch the blinking yellow dot near the bottom of the screen.
A bicycle brake converts the kinetic energy of the bike into thermal energy or heat using friction. When the brake
is applied, the pads on the brake come into contact with the rim of the rotating wheel of the bicycle.
The (8) _________friction_______between the pads and the rim converts the kinetic energy into thermal energy,
which is dissipated. As the bicycle loses its kinetic energy, it slows down or stops.
Touch the screen to exit the popup. Touch the blinking yellow dot just above the middle of the screen.
While there are many different types of brakes, all of them rely on friction between (9)___two__
surfaces to reduce kinetic energy by converting it into thermal. The earliest brake, the spoon brake consisted of a
pad that was pressed on top of the front tire. The newer rim brakes use pads to press against the rims of the
rotating wheel.
Slide your finger left to right to advance to the next screen.
Sound energy is a form of kinetic energy.
Touch the blinking yellow dot just below the middle of the screen.
Kinetic sound energy moves though (10)_____substances_____ such as
air. Sound energy travels through the air at about 340 meters per second. It takes the shape of waves. Your voice,
a bee’s buzz, a teapot’s whistle are all sound energy. Sound energy is created by vibrations, such as vibrations in a
drum or your vocal chords.
Touch the screen to exit the popup. Touch the blinking yellow dot near the center of the screen. Press play on
the video.
Sound can be considered to be composed from three areas: noise, language, and musical tone. Noise is a random
type of oscillation. The point of no vibration is called a (11) ____node_____. The point of maximum vibration is
known as the antinode. From node to node is the wave length. it is the wavelength that
determines the frequency or pitch of the sound we hear. The (12)__oscilloscope__
shows no vibration at the node of the pipe. As the microphone moves towards the middle of the pipe, it finds the
antinode. When a string is plucked we can hear its fundamental pitch. A string can vibrate at several frequencies
at once. A pure pitch has one frequency on the spectrum analyzer known as the
(13)__fundamental___________.
Every instrument has its own unique sound created out of its overtone structure.
Tap the left arrow at the top of the screen.
Select See and Learn
Tap the left arrow at the top of the screen. Select Watch and Learn Watch each video and answer the
questions. Use your earbuds if in class please.
*The Electromagnetic Spectrum (2:56)
(1) Deep inside the Sun’s core, immense gravitational pressure convert hydrogen to __ helium __
releasing energy in the form of electromagnetic radiation.
(2) The reactions inside the Sun create energy called __ Photons ___ that
travel to the surface of Earth in the form of waves.
(3) The distance between one crest to another is called a wavelength. The shorter wavelength means that there
is __ more__ energy.
*Sound, Energy, and Wave Motion (2:29)
4) Sound waves are _ compression_ waves in a medium that are converted to
electrical signals and sent by the auditory nerve to the brain where it is interpreted to sound.
(5) Sound waves have frequency and amplitude. On a sign-wave, the movement a molecule from the axis to as
far above the axis to as far below the axis and back to the axis is known as one vibration
or __ cycle __.
(6) The number of sound waves there are per second the sound wave produces through the medium it is
traveling through is known as its __ frequency __.
*Bill Nye-The Science Guy on Heat (2:05)
(7) The molecules is cold things move more __ slowly __ than the molecules
in hot things.
(8) A hot burning match has less heat energy than the ice sculpture because the ice sculpture
has more _ molecules__.
*Geothermal power: how does it work? (2:09)
(9) The subterranean heat resources are more accessible at the frontiers of
__tectonic plates___ where volcanic activity is common.
(10) Geothermal power is called a __base load__ power
source, operating 24 hours seven days a week, making it an appealing renewable energy resource.
*Real World: Work, Force, Energy, and Motion (8:50)
(11) The use of force to move an object a certain distance is known as __ work ___.
(12) To be counted as work, the applied force has to be in the same direction as the _motion___ of the object.
(13) Work = ___force____ times ____distance_____.
(14) Force is measured in Newtons and distance is measured in meters. A Newton-meter is known as a
__ Joule __, or a standard unit used to measure work.
(15) Lifting an apple is an example of a __ transfer ____ of energy.
(16) Stored energy is known as __ potential __ energy.
(17) Potential energy based on the height of an object is known as __ gravitational__
potential energy
(GPE). It depends on mass, acceleration, and height.
(18) The unit for measuring gravitational potential energy is the ___ Newton-meter __.
(19) The kinetic energy of an object depends on its mass and _____ velocity _____.
*Physics for Kids Rutgers- Energy of Motion (5:17)
(20) To keep something in rotational motion, a gravitational pull towards the __ center __
of the circle is necessary.
*Electromagnetic Spectrum: Radio waves (3:57)
(21) The longest waves that contain the least amount of any electromagnetic energy are known
as__ radio waves _____.
(22) Radio waves are electromagnetic have been used to discover quasars, pulsars, and plasma clouds. NASA’s
Stereo Satellite can monitor radio waves from the Sun’s _ corona___.
*This is Science “Sound” Experiment (6:02)
(23) In the experiment, friction causes vibration and the cup amplifies the sound. The __shape__
and __volume__ of the container changes the sound that is created when a damp cloth is dragged along the
string attached.
Tap the left arrow at the top of the screen.
Kinetic Energy
1.. What is electrical kinetic energy?
A. The destruction of electrons.
B. The combining of electrons.
C. The separation of electrons.
D. The movement of electrons.
2. Kinetic energy is best described as
A. waiting.
B. working.
C. always increasing.
D. always decreasing.
3. How many major types of kinetic energy were named in
the lesson?
A. two
B. Three
C. Four
D. Five
4. X-rays are a type of __________.
A. Thermal energy
B. Sound energy
C. Radiant energy
D. Radiant terrestrial energy
5. How is kinetic energy related to potential energy?
A. When potential energy decreases, kinetic energy
increases.
B. When potential energy decreases, kinetic energy
decreases.
C. Both depend on mass and velocity.
D. Both move objects from one place to another.
6. Which of the following is true?
A. Only living things can have kinetic energy.
B. Only living things can have potential energy.
C. Only moving objects have energy.
D. None of the above.
7. Where would molecule be vibrating the fastest?
A. In a glacier
B. In a cup of water
C. In a baker’s oven
D. At the Sun’s surface
8. Which is the best example of mechanical kinetic energy?
A. A baseball in flight
B. A bird’s whistle
C. Ultraviolet light
D. Heat from a light bulb.
Select Quiz and Learn
9. Fill in the blank. When an apple starts to fall from a tree,
___________________.
A. Its potential energy becomes kinetic energy.
B. Its potential energy becomes potential energy.
C. Its potential energy and kinetic energy increase.
D. Its potential energy and kinetic energy decrease.
10. Which is an example of kinetic energy?
A. Gallons of airplane fuel intended for burning.
B. An airplane waiting to take off.
C. An airplane circling to land.
D. All of the above.
11. A car with one passenger is traveling don the highway.
Which action would decrease the car’s kinetic energy?
A. Add a passenger or heavy luggage.
B. Increase the car’s speed.
C. Slow the car down.
D. You cannot change kinetic energy.
12. When a ball drops and bounces a few times, why does it
lose height with each bounce?
A. Its kinetic energy increases.
B. Some of its kinetic energy is lost.
C. The ball absorbs terrestrial energy.
D. Some of its potential energy becomes
13. A 75-pound boy and his 150 pound father jog together at
five miles per hour. Who has more kinetic energy?
A. the boy
B. the father
C. neither
D. more information is needed.
14. Which of three identical toys will have the most kinetic
energy when it falls to the floor?
A. A toy set on the floor.
B. A toy left on a coffee table.
C. A toy hidden on top of a refrigerator.
D. The toys have identical amounts of kinetic energy.
15. If you throw a ball up into the air and catch it, at what
point does it have the most kinetic energy?
A. Before it leaves your hands.
B. When you release it.
C. When it turns to fall down.
D. When you catch it.
Select the back button twice to the home page. Select Energy Transformation
Select Read and Learn
Read through all of the information.
Did you KNOW: (Scroll through and READ the facts at the bottom of the screen.)
Tap the left arrow at the top of the screen. Select Touch and Learn Fill in the blanks and answer the
questions as you cycle through the information.
Plants convert solar energy into chemical energy.
Touch the blinking yellow dot just above and to the right of center of the screen.
The leaves of a plant contain a green pigment call (1)___chlorophyll___, which
absorbs the Sun’s energy. This energy is used by the plant to convert carbon dioxide and water into oxygen and
carbohydrates.
Thus energy from the Sun is transformed into chemical energy stored in the (2)__carbohydrates____.
The plant uses this chemical energy to grow, and produce flowers and seeds.
Touch the screen to exit the popup. Touch the blinking yellow dot just below the center of the screen. Press
play on the video.
Proteins, fats, nucleic acids, and carbohydrates are synthesized by light energy in the cells.
Chloroplasts contain chlorophyll. (3)____Thylakoids__ are hollow disks
within chloroplasts.
The molecules of life are synthesized in the stroma of a plant. Glucose is converted into
(4)__starch____ by plants to use for energy.
Slide your finger left to right to advance to the next screen.
Energy is transformed during a typical lightning strike.
Touch the blinking yellow dot just above and to the left of center of the screen.
During a lightning strike, the (5)___electric____ potential energy
created by the charge in the clouds is transformed into light energy, sound energy, and thermal energy. About 1
billion to 10 billion joules of energy is associated with an average three mile long lightning strike.
Touch the screen to exit the popup. Touch the blinking yellow dot just above and to the right of center of the
screen. Press play on the video.
The lightning flash that you see is referred to as the return stroke. Flash is what you can see, a lightning stroke are
individual pulses of current separated by hundredths of a second. A lightning strike hits the ground.
Thunderstorms develop when the atmosphere is (6)___unstable___ and warm air tries
to rise up and pushes up cooler air.
Slide your finger left to right to advance to the next screen.
A windmill transforms the kinetic energy of the (7)__wind__ into mechanical
or electrical energy.
Touch the blinking yellow dot on the center of the windmill blades.
A windmill converts the kinetic energy of the wind into (8)____rotational__
mechanical energy. Unlike a wind turbine, that was developed to generate electricity, windmills were primarily
used for industrial purposes such as milling grains, pumping water, etc.
Touch the screen to exit the popup. Touch the blinking yellow dot just above and to the left of center of the
screen.
Uneven heating of the Earth’s (9)___atmosphere_____ by the Sun and
the Earth’s rotation cause differences in atmospheric pressure that result in winds. Wind energy is the kinetic
energy of the air in motion.
Slide your finger left to right to advance to the next screen.
(10)______solar panels ___ transform radiant solar energy into electrical energy.
Touch the blinking yellow dot just below and to the left of center of the screen.
When sunlight hits a solar panel, its energy is absorbed by the semiconducting material in the panel and is used to
form charge carriers. In the presence of an (11)______electric field___,
these charges separated forming the electric current. This is known as the Photovoltaic effect.
Touch the screen to exit the popup. Touch the blinking yellow dot just above and to the right of center of the
screen. Press play on the video.
Solar cells convert sunlight into electricity. Sand is processed into purified (12)____silicone______
and doped with trace amounts of boron and phosphorus, creating a P-N junction. A permanent electric field is
created within the crystal. When sunlight strikes a solar cell, electrons ejected from atoms and are steered to the
N-type side. If a wire is connected to both sides of the cell, electric current can flow whenever sunlight strikes the
solar cell.
Slide your finger left to right to advance to the next screen.
A (13)_resistance___ heating wire transforms electrical energy into thermal energy.
Touch the blinking yellow dot on the left side of the screen.
The ratio of the output energy to the input energy is known as the energy (14)___conversion____
efficiency. Combustion engines, such as those in a car, have energy conversion efficiencies less than 50%
Our muscles energy conversion efficiency is between 15% - 25%. Wind turbines can have up to
(15)__90%__, while solar cells can have conversion efficiencies up to 40%. Electric space heaters can have up to
100% energy conversion efficiency.
Touch the screen to exit the popup. Touch the blinking yellow dot just to the right of center of the screen.
Ceramic heaters have a (16)___resistance_____ heating wire that is embedded in a ceramic material.
When it is turned on, the resistance wire inside the heater transforms the electrical energy into thermal energy.
This thermal energy is then transformed to the ceramic material, which then radiates the heat. The
(17)__fan___ inside the heater blows the heated air.
Tap the left arrow at the top of the screen.
Select See and Learn
Tap the left arrow at the top of the screen. Select Watch and Learn Watch each video and answer the
questions. Use your earbuds if in class please.
*Energy: Bill Nye on Energy Part 1 (8:50)
(1) Sound, heat, falling things, moving muscles, electricity are forms of ___ energy ___.
(2) Baking soda and vinegar caused a chemical reaction that builds up pressure so the top of the bottle comes
off because __ chemical __ energy changes into __ movement/kinetic ____ energy.
*Energy: Bill Nye on Energy Part 2 (6:06 )
(3) Nuclear power comes from __ atoms___.
(4) Water spins the propellers on a __ turbine __. This spinning turbine turns
a generator that then creates electricity.
(5) A laser converts ____electrical__ energy into___heat_____
energy by causing gas molecules to vibrate at same speed as heat waves.
*Energy: Bill Nye on Energy Part 3 (8:02)
(6) Oil is a ____fossil fuel____ and is one of the major forms of energy
that we use.
(7) Energy changes form in your body as food is broken down into _fuel___. Some of
that energy is changed into heat.
(8) Energy we get from food began as _light__ energy from the Sun.
*The Simple Story of Photosynthesis and Food (4:00)
(9) Sixty percent of the foods you eat are __carbohydrates__ that contain carbon,
hydrogen, and oxygen.
(10) The high energy rays of the Sun help a plant break apart a water molecule to be used during the process of
___photosynthesis___.
(11) Glucose is turned into ATP in the _mitochondria_ of cells which provide
the energy our bodies need.
*Batteries of the Future: chap. 5 (3:48)
(12 )Lithium-ion batteries that are used in cell phones, laptops, etc. have three parts known as what?
anode, cathode and electrolyte
(13) In a Lithium-ion battery, high concentrations of lithium atoms start in the anode and move to the cathode
in a _discharge__ process. In a charging process the atoms move in
the opposite direction.
*Forms of Energy (excerpt) (1:21 )
(14) Heavier objects have_more__ kinetic energy than lighter objects moving at the same speed.
Tap the left arrow at the top of the screen.
Transformation
1. Most car engines transform __________________ into
_______________.
A. chemical energy, mechanical energy
B. mechanical energy, chemical energy
C. thermal energy, mechanical energy
D. kinetic energy, potential energy
2. The law of conservation of energy states that
A. energy is constantly created
B. energy is constantly destroyed
C. energy is renewable
D. energy cannot be created or destroyed
3. Which phase describes the energy of a burning log?
A. potential energy
B. light energy
C. thermal energy
D. all of the above
4. A plant converts ___________ into ________________.
A. thermal energy, chemical energy
B. chemical energy, solar energy
C. solar energy, mechanical energy
D. solar energy, chemical energy
5. Wind is a type of ______________.
A. chemical energy
B. kinetic energy
C. geothermal energy
D. always renewable energy
6. Which type of energy transformation is newest to
humans?
A. solar
B. wind
C. chemical
D. nuclear
7. Which of the following transforms sound energy into
electrical energy and then back into sound energy?
A. a car motor
B. a television
C. a telephone
D. all of the above
8. Which of the following is true?
A. Cars rely on potential chemical energy.
B. Plant energy is not useful.
C. Electric cars are 100% efficient.
D. all of the above
Select Quiz and Learn
9. An old-fashioned light bulb converts electricity into heat
and light. The loss of energy is called:
A. fossil fuel transformation
B. entropy
C. 100% efficiency
D. fluorescence
10. When energy changes form,
_____________________________
A. the change is always permanent.
B. a portion of it is destroyed.
C. it can take more than one new form.
D. it can take only one new form.
11. What is meant by “a more fuel-efficient” car?
A. The car uses biomass as fuel.
B. The car’s top speed is above average.
C. The car doesn’t experience friction.
D. The car loses less energy as heat.
12. A spaceship without fuel could move in outer space.
What explains this best?
A. The Law of Energy Conservation
B. The ship is moved by powerful winds.
C. The ship is powered by the Sun.
D. The ship is powered by space energy.
13. Which of the following could possibly power a light bulb?
A. a person jogging
B. sound waves from a music concert
C. energy from chemical bonds
D. all of the above
14. How would an energy-efficient light bulb best compare
with a standard bulb?
A. It would produce less heat and more light.
B. It would produce equal amounts of light and heat.
C. It would produce more heat and more light.
D. It would produce more heat and less light.
15. Compare the potential energy of ice molecules with the
potential energy of liquid water molecules.
A. Ice molecules have more potential energy.
B. Ice molecules have less potential energy.
C. The potential energy of ice and water is equal.
D. More information is needed.