Question

$kilowatthour$ is commercial unit of

• A. power
• B. electric energy
• C. heat energy
• D. mechanical energy

Answer 1

The correct option is B

electric energy

Explanation for the correct option:

B) electric energy

1. $kilowatthour$ is the commercial unit of electrical energy.
2. It is defined as the amount of energy in a device that is consumed in one working hour at a constant rate of one kilowatt.

Explanation for the incorrect options :

A) Power:

The SI unit of electric power is$joulepersecond$, so it is an incorrect option.

C) Heat energy:

$Calorie$ is the unit of heat energy, so it is an incorrect option.

D)Mechanical energy:

The SI unit of mechanical, thermal, and electric energy is the same and it is $joule$, so it is an incorrect option.

Final answer: Hence, option (B) electric energy is correct.