Question

A lamp rated 100W at 220V is connected to the mains electric supply . What current is drawn from the supply line it the voltage is 220V

Answer 1

Power (P) = Volt (V) x Current (I)
Hence, I=P/V
=100/220 = 0.4545.. A

Answer 2

Answer : The current drawn from the supply is 0.45 A.

Explanation :

It is given that,

Power of the lamp, P = 100 W

Voltage, V = 220 V

We know that the power of electrical appliance is given by :

$P=V\ I$

I is the drawn current from the supply

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

$I=\dfrac{100\ W}{220\ V}$

$I=0.45\ A$

Hence, this is the required solution.