Question 3
EasyOriginal questionThe 'unit' on a household electricity bill, the kilowatt-hour, measures
Show the answer and explanation
CorrectNot quiteAnswer D
Correct answer: D
Explanation
A kilowatt-hour is the energy used by a 1 kW appliance running for 1 hour.
Power × time = energy, so kWh is a unit of energy: 1 kWh = 36,00,000 J.
Worth noting
The kilowatt alone is power; multiplying by hours turns it into energy.
- Concept
- The kilowatt-hour as a unit of energy
- Typical timeTypical
- 35 s
- Your timeYours
- —
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