Question

The commercial unit of power is kWh, which is equal to:

• A. 1.3 ​ joules
• B. 3.6 ​ joules
• C. 3.6 ​ joules
• D. 1.3 (\times\) ​ joules

Answer 1

The correct option is B

3.6 ​ joules

$\text{1 kWh}$ is the energy used for one hour at the rate of $1000J{s}^{-1}$.
So, $1kWh=1000{Js}^{-1}\times 3600\text{seconds}$
$1kWh=3.6\times {10}^6\text{joules}$​