Question

A bulb is rated $100W-240V$. What is the magnitude of current drawn by the bulb?

Answer 1

Step 1: Given

Power$\left(P\right)=100W$

Voltage$\left(V\right)=240V$
Let $I$ be the current in the circuit.

Step 2: Finding the current

We know that, $P=I\times V$

$$\begin{gathered} 100=I\times 240 \\ I=\raisebox{1ex}{$100$}\!\left/ \!\raisebox{-1ex}{$240$}\right. \\ I=0.416A \end{gathered}$$

Hence, the magnitude of current drawn by the bulb is $0.416A$.