Download Electricity Skill Review Do NOT write on this booklet please. Name

Electricity Skill Review
Do NOT write on this booklet
please.
Name:____________________
Electrical Principles and Technologies
Year End Unit Review Final
Instructions: Read each question carefully, choose the best answer and place it in the blank provided.
Use the following diagram to answer questions 1, 2, and 3.
A
B
_____1. Balloon A was rubbed vigorously on someone’s hair. How would balloon A best be described?
A. neutral
B. electrically discharged
C. electron-filled
D. statically charged
_____2. If the negative surface of balloon A is brought near balloon B, what is likely to happen to the charges on balloon B?
A. Negative charges will move away from balloon A.
B. Positive charges will move away from balloon A.
C. All charges will move away from balloon A.
D. All charges will move toward balloon A.
_____3. If the negative surface of balloon A is brought near balloon B, what is the most likely result?
A. Balloon B will be repelled and move away from balloon A.
B. Balloon B will be attracted and move toward balloon A.
C. Balloon B will be unaffected and not move.
D. Balloon B will rotate slowly.
Use the following information and diagram to answer questions 4 and 5.
A student builds a circuit with a glowing bulb. She
then sketches what she has built.
4. Match each circuit component, as numbered above, with the primary function that it performs. Use each number
only once.
__________ converts electric energy to light and heat
__________ conducts current
__________ provides a potential difference
__________ melts if current levels are too high
5. The top of the cell in the diagram represents the positive terminal. Trace the flow of electrons through the four items in the
circuit, starting from point X in the diagram. Indicate the proper order by placing the numbers of the components from left
to right in the spaces below.
__________
__________
__________
__________
Use the following information to answer question 6.
Students working on an activity have a gap that they must fill in order to complete a circuit between a dry cell and a
lamp. They have the choice of 10-cm lengths of the following:
1. copper wire
2. glass rod
3. rubber tubing
4. wooden stick
_____6. The students choose the copper wire because
A. copper can create current
B. copper provides the best resistance to current flow
C. copper is flexible
D. copper is a good electrical conductor
Use the following information to answer question 7.
A student would like to report measurements of the following quantities:
1. temperature
2. voltage
3. current
4. resistance
7. Match the measurements that the student would like to report with the appropriate units for each measurement. Do this by
placing the placing the appropriate number in each space below.
___________
ohms
___________
volts
___________
degrees
___________
amperes
Use the following information to answer question 8.
A clothes dryer provides 16 Ω of total resistance in its circuitry. The dryer is connected to a 240-V outlet.
8. The amount of current the dryer draws is ____________ A.
Use the following information to answer question 9.
A student makes a list of electrical components:
1. fuse
2. motor
3. battery
4. resistor
9. Match the electrical component with its appropriate schematic symbol by placing the appropriate number the space below
each symbol.
__________
__________
__________
__________
_____10. A student uses a waterfall as a model of the flow of electricity. Which of the following would be the best match to
voltage?
A. rocks in the path of the water
B. the height of the waterfall
C. the amount of water in the flow
D. the size of the splash at the bottom of the fall
Use the following information to answer question 11.
A homeowner wants to be able to adjust the light level in her dining room. She asks an electrician to install a special
component in the circuit.
_____11. The item most likely installed in the circuit to provide light-level control is a
A. lamp
B. fuse
C. conductor
D. rheostat
Use the following information to answer questions 12 and 13.
In a busy evening of doing homework, a student uses the following four devices. The power, in watts, of each device
is as follows:
▪ computer, 480 W
▪ stereo system, 800 W
▪ toaster oven, 1100 W
▪ coffee maker, 1600 W
_____12. If the computer draws 4.0 A of current, what voltage is being supplied to the computer?
A. 120 V
B. 484 V
C. 1920 V
D. 8.3 mV
_____13. Which of the following, if “on” continuously, uses the most energy in a 24-hour period?
A. the computer
B. the stereo system
C. the toaster oven
D. coffee maker
Use the following information to answer questions 14 and 15.
A student uses a 400-W electric chainsaw continuously during 100 minutes of cutting wood. The chainsaw is
approximately 40% efficient at converting energy.
_____14. How much energy did the chainsaw consume while cutting the wood?
A. 2.4 J
B. 2.4 MJ
C. 40 000 J
D. 40 000 MJ
_____15. What energy transformation does the chainsaw perform?
A. electrical to mechanical
B. mechanical to electrical
C. chemical to mechanical
D. mechanical to chemical
Use the following information to answer question 16.
A student drew a sketch of an electric motor as follows.
16. Label the parts of the motor indicated in the diagram by matching the numbers in the diagram with the following parts:
__________
commutator
__________
brush
__________
magnet
__________
armature
Use the following information to answer question 17.
The following energy transformation information was collected from a series of devices:
▪ A jet boat produces 128 kJ of mechanical energy from 1020 kJ of input chemical energy.
▪ An incandescent light produces 56 J of light energy from 850 J of input electrical energy.
▪ A luxury car produces 88 kJ of mechanical energy from 1000 kJ of input chemical energy.
▪ A motorbike produces 348 J of mechanical energy from 1220 J of input chemical energy.
17. Rank the devices from most to least efficient. Do this by placing the numbers 1 (most efficient) to 4 (least efficient) in the
spaces below.
__________
jet boat
__________
light
__________
luxury car
__________
motorbike
_____18. You have invented a high-temperature furnace for incinerating garbage, but you need a way of measuring
temperature inside. This could be done using a:
A. thermocouple
B. generator
C. resistor
D. transformer
Use the following information to answer question 19.
A group of students made a list of the characteristics of energy for a research project.
1. Heat trapped from hot rock within Earth’s crust provides energy for electricity
generation.
2. Devices harness the energy released by atomic fission for use in electrical
generation.
3. Generating plants capture the energy of falling water.
4. Biodegradable waste from landfill serves as the energy source.
19. Match the characteristics with the proper energy source.
__________
nuclear
______________
hydro-electricity
__________
geothermal
__________
biomass
_____20. Hydro-electric plants are also found in Alberta. Which of the following do a coal-fired generating plant and hydroelectric power plant have in common?
A. turbine
B. combustion chamber
C. penstock
D. high-pressure steam
_____21. Which of the following is NOT an environmental problem commonly associated with coal-fired power plants?
A. sulfur dioxide
B. fly ash
C. flooding
D. acid rain
Use the following information to answer question 22.
The following schematic represents a circuit built by a student.
_____22. The most obvious problem with the circuit is that
A. the bulbs are connected in parallel
B. the bulbs are connected in series
C. there is no switch
D. the battery is connected improperly
_____23. Which of the following devices uses the most energy?
A. a 600-W microwave oven used for 20 minutes
B. a 100-W bulb left on for 8 hours
C. a 1150-W hair dryer used for 8 minutes
D. a 900-W hot plate used for 15 minutes
_____24. The most appropriate unit for reporting the amount of electrical energy used by a family every month would be the
A. watt
B. joule
C. kilowatt hour
D. volt
_____25. Which of the following would be most likely to approach 100% efficiency as an
energy converter?
A. an alkaline dry cell
B. a halogen lamp
C. a gasoline-electric hybrid vehicle
D. an electric heater