Question

A lamp rated at 100w at 220v is connect ed to the main electric supply. What is its attachments resistance. What amount of current is drawn from the supply of line if the voltage is 220v

Answer 1

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= VI

I is the drawn current from the supply

I= P/V

I= 100W/220V

I= 0.45A