Question: Kilowatt–hour is a unit of: [PMT/NEET-1991]
a. Electrical charge
b. Energy
c. Power
d. Force
Answer: b. Energy
Solution:
$1\ \text{kWh} = (10^{3}\ \text{W})(3600\ \text{s}) = 3.6\times10^{6}\ \text{J}$,
which is work or energy, not power.
