Question

$1Wh$ (Watt hour) is equal to :

• A. $36\times {10}^{5}J$
• B. $36\times {10}^{4}J$
• C. $3600J$
• D. $3600{Js}^{-1}$

Answer 1

Answer: (C)

$3600J$

Watt is a unit of power such that $1W=1\frac{J}{s}$

Also we know $1h=3600$ $s$

$\therefore$ $1Wh=1\frac{J}{s}\times 3600$ $s=3600$ $J$