WorksheetsElectricity Use in Homes and Businesses
Total questions: 12
Worksheet time: 6mins
Which component in a nuclear power plant actually produces electrical energy?
a turbine
steam
generator
What do transformers do in the generation and distribution of electrical energy? Check all that apply.
decrease voltage
convert water into steam
increase voltage
turn turbines
What is usually needed for generating electrical energy when using fossil fuels but not needed when using wind or water?
energy put into a plant
rotating generators
high-pressure steam
What do hydroelectric plants use to generate electrical energy?
falling water
natural gas
fission of uranium
What is the rate at which electrical energy is converted into other forms of energy?
electric current
electrical power
energy efficiency
What is the unit for electrical power?
volt (v)
Joule (J)
Watt (W)
A 12-volt battery provides a current of 2.0 A to a circuit.
The power output of the battery, to the nearest whole number, is
24 W
12 W
6 W
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?
The 100 W bulb uses 2.5 times more energy
The 40 W bulb uses 2.5 times more energy
The 100 W bulb uses 60 times more energy
A ceiling fan uses 0.45 kWh of energy in 6 hours. What is the power rating of the fan?
0.075 W
2.7 W
75 W
Compact fluorescent lightbulbs (CFLs) cost more than incandescent lightbulbs and have lower wattages than incandescent bulbs. Which statement best describes why a homeowner would choose to pay the extra money for the CFLs?
CFLs use the same amount of energy as incandescent lights, but they last much longer and do not need to be replaced as often.
CFLs use more energy as a result of the lower wattages, but electric companies charge less for energy used in CFLs.
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.
The ratio of useful energy output to total energy input is called energy
efficacy
transformation
efficiency
Which statement best describes a device that has a high energy efficiency?
its ratio of energy absorbed to energy released is high
it wastes little energy
it wastes a lot of energy
