Question

Kilowatt-hour is the unit of __________.
i) potential difference
ii) electric poweriii) electric energy
iv) charge

Answer 1

it is the unit of (iii)electric energy.

power=energy/time
so, energy = power× time

we know watt is unit of power and multiple time with power we get energy.

Answer 2

The kilowatt-hour (symbolized kWh) is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour (1 h) of time. The kilowatt-hour is not a standard unit in any formal system, but it is commonly used in electrical applications.