Question

An electric bulb of $60W$ is used for 6 hours per day. Calculate the units of energy consumed in one day by the bulb.

Answer 1

Step 1: Given

Power, $P=60W$

Time, $t=6hours$

Step 2: Calculating Energy

By the definition, $P=\frac{E}{t}$where P = Power, E = Energy, t = time

Hence, $E=P\times t$

$$\begin{gathered} E=60W\times 6h \\ E=360Wh \end{gathered}$$

$$\begin{gathered} E=\frac{360}{1000}kWh\left[As1000W=1kW\right] \\ E=0.36kWh \end{gathered}$$