AnswersCrowley Credit Recovery Physics BOhm'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.
3

The chart shows the power ratings of 3 clothes dryers and the time needed to dry a load of 10 towels. What is the difference in energy used between the dryer that uses the greatest amount of energy and the dryer that uses the least amount?

Question illustration
A
0.18 kWh
B
0.20 kWh
C
1.62 kWh
D
1.82 kWh
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
11

What is the unit for electrical power?

A
volt (V)
B
joule (J)
C
kilowatt-hour (kWh)
D
watt (W)
12

A hair dryer has a resistance of 11.5 Ω at 120 V.

A
1,250 W
B
1,380 W
C
15,900 W
D
167,000 W
13

What is the rate at which electrical energy is converted into other forms of energy?

A
electric current
B
electrical power
C
energy efficiency
D
electrical resistance
14

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.

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