Question

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

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

Answer 1

The correct option is D $864\text{MJ}$

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, $240\text{units of energy}=240\times 3.6\times {10}^6$
$=864\times {10}^6\text{J}=864\text{MJ}$