Question

One watt hour equals

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

Answer 1

The correct option is A $3600J$

The watt-hour (symbolized $Wh$) is a unit of energy equivalent to one watt $\left(1W\right)$ of power expended for one hour $\left(1h\right)$ of time. $1$ Watt is $1$ Joule per second, and there are $3600$ seconds in an hour $(60\times 60=3600)$. So one watt hour equals $3600J$.