Question

One watt hour equals

• A. 3600 J
• B. 360 J
• C. 36 J
• D. 3.6 J

Answer 1

The correct option is A

3600 J

1. $Onewatthour$ is the amount of electrical energy spent by a source of power of $1watt$ in $1hour$.

$$\begin{gathered} 1watthour=1watt\times 1hour \\ =1J{s}^{-1}\times 3600s \\ =3600J \end{gathered}$$

Hence, A) is the correct option.