Question

One kilowatt hour is equal to

• A. $36\times {10}^5$ joules
• B. $36\times {10}^3$ joules
• C. ${10}^3$ joules
• D. ${10}^5$ joules

Answer 1

The correct option is A $36\times {10}^5$ joules

$1$ kW $=1000$ $\frac{J}{s}$

$1$ h $=3600$ s

$\therefore$ $1$ kWh $=1000\frac{J}{s}\times 3600$ $s=36\times {10}^5$ $J$