Question

The commercial unit of electrical energy is:

• A. Kilowatt hour
• B. Volt
• C. Watt
• D. Joule

Answer 1

The correct option is A Kilowatt hour

Kilowatt hour is the commercial unit of electrical energy. It is defined as the electrical energy consumed when $1$ kilowatt of power is used for $1$ hour.

$1kWh=1000W\times 3600s$
$=3.6\times {10}^{6}Ws$
$=3.6\times {10}^{6}J$