Question

How much current will an electric heater rated $1kW$ draw when connected to a $220V$ supply?

Answer 1

Step 1: Given data and formula used

Given data:

1. Power of the heater is $P=1kW=1000W$
2. Supply voltage is $V=220V$

Formula:

Power of an electric heater is

$P=VI$

where $I$ is the current.

Also, it can be written as

$I=\frac{P}{V}$

Step 2: Finding the current drawn by the heater.

Substitute the values of power and voltage into the equation to calculate the current.

$$\begin{gathered} I=\frac{1000W}{220V} \\ I=4.55A \end{gathered}$$

Thus, the electric heater will draw $4.55A$ current when connected to a $220V$ supply.