Question

a bulb is rated 40 watt and 220 volts find the current drawn by it when connected to a 220 volt supply

Answer 1

we know that P= IV
I =P/V
I= 40/220
=4/22
=0.8 1C

Answer 2

The formula for electric power is given by :

P = IV

where :

P = The power measured in watts.

I = The current measured in Amperes.

V = The voltage measured in Volts.

In this question we have :

Power = 40 watts

Voltage = 220 Volts

From the formula of power we can obtain current:

I = P/V

We do the substitution as follows:

I = 40/220

I = 0.1818 A

The bulb hence draws a current of 0.1818 A from the volt supply.