Electricity Use in Homes and Businesses Answers
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Gina examines the equations for electric power and Ohm's law. She thinks that there is a third equation that can calculate power using only voltage and resistance.
A
It is correct, because I = .
B
It is correct, because I = .
C
It is incorrect, because both equations for power use current.D
It is incorrect, because Ohm’s law does not include I2.4
Compact fluorescent lightbulbs (CFLs) cost more than incandescent lightbulbs and have lower wattages than incandescent bulbs.
A
CFLs use the same amount of energy as incandescent lights, but they last much longer and do not need to be replaced as often.B
CFLs use more energy as a result of the lower wattages, but electric companies charge less for energy used in CFLs.C
CFLs will cost less to run in the long term because they use less energy than the incandescent bulbs as a result of the lower wattage.D
CFLs will cost less to run in the long term because they are brighter and would need to be on for fewer hours.5
What is usually needed for generating electrical energy when using fossil fuels but not needed when using wind or water?
A
energy put into the plantB
rotating generatorsC
spinning turbinesD
high-pressure steam6
Which component in a nuclear power plant actually produces the electrical energy?
A
a turbineB
steamC
a generatorD
uranium7
What do hydroelectric plants use to generate electrical energy?
A
falling waterB
natural gasC
fission of uraniumD
wind8
A 4.0 W LED bulb produces 240 lumens.
A
1.7 lm/WB
60 lm/WC
236 lm/WD
244 lm/W9
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10
An incandescent bulb produces 520 lumens and has an efficacy of 13 lm/W.
A
2.5 WB
40 WC
503 WD
533 WDid you find these answers helpful?
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