Question

Kilowatt-hour is the unit of :

• A. electric energy
• B. electric power
• C. electric charge
• D. electric current

Answer 1

The correct option is A

electric energy

Explanation of correct option:

A: Electric energy

1. Electric energy: It is defined as that form of energy which is derived from electric potential energy or kinetic energy of the charged particles.
2. Its formula is, $Electricenergy=ElectricpowerxTime$
3. We know that unit of electric power is $kilowatt$ and time is $hour$.
4. So, the unit of electric energy is $Kilowatt-hour$.

Explanation of incorrect option(s):

B: Electric power

$Wattorkilowatt$ is the unit of electric power.

C: Electric charge

$Coulomb$ is the unit of electric charge.

D: Electric current

$Ampere$ is the unit of electric current.

Hence, option (a) is correct.