Question

A household has consumed $240\text{units}$ of electrical energy during a month. How much energy is that in joules? $\left[1\text{mark}\right]$

$\text{A}.864\text{MJ}$
$\text{B}.900\text{MJ}$
$\text{C}.653\text{MJ}$
$\text{D}.235\text{MJ}$

Answer 1

Correct answer: option A $\left(864\text{MJ}\right)$ $\left[1\text{mark}\right]$

1 unit of energy is equal to 1 kilowatt hour (kWh).
$1\text{unit}=1\text{kWh}$
$1\text{kWh}=3.6\times {10}^6\text{J}$
Therefore, $240\text{units of energy}=240\times 3.6\times {10}^6$
$=864\times {10}^6\text{J}=864\text{MJ}$