AnswersDSD-CR-Physics-Term 4Ohm's Law

Electricity Use in Homes and Businesses Answers

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1
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What do hydroelectric plants use to generate electrical energy?

A
falling water
B
natural gas
C
fission of uranium
D
wind
2
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How does the energy used by a 100 W lightbulb compare with the energy used by a 40 W lightbulb in a given amount of time?

A
The 100 W bulb uses 2.5 times more energy.
B
The 40 W bulb uses 2.5 times more energy.
C
The 100 W bulb uses 60 times more energy.
D
The 40 W bulb uses 60 times more energy.
5

What do transformers do in the generation and distribution of electrical energy? Check all that apply.decrease voltageconvert water into steamincrease voltageturn turbinesturn generators

A
decrease voltage
B
convert water into steam
C
increase voltage
D
turn turbines
E
turn generators
6

Which component in a nuclear power plant actually produces the electrical energy?

A
a turbine
B
steam
C
a generator
D
uranium
7

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.
8

Which statement best describes a device that has a high energy efficiency?

A
Its ratio of energy absorbed to energy released is high.
B
Its ratio of energy input to energy output is high.
C
It wastes little energy.
D
It wastes a lot of energy.
9

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 = .
Option A
B
It is correct, because I = .
Option B
C
It is incorrect, because both equations for power use current.
D
It is incorrect, because Ohm’s law does not include I2.
10

efficacytransformationefficiencyloss

A
efficacy
B
transformation
C
efficiency
D
loss

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