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This quiz contains 9 questions from a mix of 1 subtopics.
What is the correct equation for calculating energy usage based on an appliance's power rating?
energy (kWh) = power (W) - time (h)
energy (kWh) = power (W) + time (h)
energy (kWh) = power (W) × time (h)
energy (kWh) = power (W) ÷ time (h)
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If a 2 kW heater is used for 2 hours, how much energy is used?
4 kWh
2 kWh
3 kWh
1 kWh
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Which of the following statements is true about appliances with higher power ratings?
they cost less to run
they use more energy over a time period
they transfer less energy
they use less energy over a time period
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What unit is food energy content measured in on nutrition labels?
kilograms (kg)
kilowatt-hours (kWh)
kilowatts (kW)
kilojoules (kJ)
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What does the power rating of an appliance tell you?
the cost of running the appliance
the amount of energy it uses per second
the total energy it uses over its lifetime
the time it takes to transfer a certain amount of energy
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Which of the following factors does the energy usage of an appliance depend on?
both power rating and time used
neither power rating nor time used
time used
power rating
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If a 3 kW kettle is used for 0.2 hours, and a 1.5 kW toaster is used for 0.1 hours, which appliance uses more energy?
the kettle
they use the same amount of energy
the toaster
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What is the term for the amount of energy an appliance uses per second?
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Explain how you would calculate the energy used by a 3 kW appliance that runs for 2.5 hours.
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