Question

An electric heater of $750W$ is used $2h/day$. Calculate the units of energy consumed in $30days$ by it.

Answer 1

Step 1: Given data

Power of electric heater, $P=750W$

Usage per day $=2h$

No. of days$=30days$

Step 2: The units of energy consumed can be calculated using the formula

$$\begin{gathered} Power\left(P\right)=\frac{Energy\left(E\right)}{Timetaken\left(t\right)} \\ \Rightarrow 750W=\frac{E}{2h} \\ \Rightarrow E=750\times 2\times 30 \\ \Rightarrow E=45000Wh \\ \Rightarrow E=45kWh=45units \end{gathered}$$

Hence, the units of energy consumed in one day by the electric heater is $45units$.