Download PS3 PPt ps3.powerpoint.energy

4-19-13 FRIDAY!
• Do Now: Do eclipse worksheet.
Both sides.
• LT: I can describe how energy is
transformed from one form to
another (PS3A).
Types of energy
Moving (kinetic)
energy
• Light
• Thermal
• Electrical
• Mechanical
• Sound
Potential energy
•Chemical
•Gravitational
•Elastic
•Nuclear
Energy Transfer
Efficiency
An energy diagram for the bike would
look like this :100 000 J
Chemical
Energy
80 000 J
Kinetic
8 000 J 12 000 J
Sound
Heat
Insulation
What’s in The Box?
Energy out:
Sound
energy
Energy in:
Electrical
energy
What’s in The Box?
Energy out:
Sound
energy
Energy in:
Electrical
energy
A radio converts
electricity into sound
What’s in The Box?
Energy out:
Heat
energy
Energy in:
Electrical
energy
What’s in The Box?
KS3 stuff!
Energy out:
Heat
energy
Energy in:
Electrical
energy
A cooker converts
electricity into heat
What’s in The Box?
Energy out:
Light
energy
Energy in:
Electrical
energy
What’s in The Box?
KS3 stuff!
Energy out:
Light
energy
Energy in:
Electrical
energy
A lamp converts
electricity into light
What’s in The Box?
Energy out:
Heat & Light
energy
Energy in:
Chemical
energy
What’s in The Box?
KS3 stuff!
Energy out:
Heat & Light
A match converts
energy
chemical energy into
light and heat
Energy in:
Chemical
energy
What’s in The Box?
Energy out:
Energy in:
Light Energy
Electrical
energy
Heat Energy
What’s in The Box?
Energy out:
Energy in:
Light Energy
Electrical
energy
Heat Energy
Although a lamp is meant to transfer electrical
energy into light it actually transfers most of
the energy into wasted heat.
Energy Transfer
Energy chains
Exit
1. Write the LT in your own
words.
2. What was the most important
thing you learned today?
3. What are still the most unsure
about?
• Sun> light energy>wheat>chemical
energy>breakfast>mechanical
energy>ride bike up hill>gravitational
potential energy>coast downhill>kinetic
energy>crash into tree>sound
energy>leaves shake/windows rattle>
Video
•
•
•
•
•
•
•
•
•
Matter? Everything in the Universe. Solid-liquid gas.
Matter needs energy to change.
Energy constantly changing
Never created/destroyed
Energy can be transferred
Work: force working over a distance to move an object. A transfer of energy.
Also needs energy!
…stacking boxes. Potential changed to kinetic
Potential energy: Position—spring (elastic)—
Law of conservation of mass and energy—Einstein—
–
–
•
Ping pong/golf ball
Heat transfer. Conduction, convection, radiation
Efficiency
In any energy change there is ALWAYS
wasted energy
•When a zebra eats the grass, it does
not obtain all of the energy the grass
•When a lion eats a zebra, it does not
get all of the energy from the zebra
•Only 10% of the energy from one
trophic level is transferred to the
next – this is called the 10% law