Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

The voltage across both bulbs will be the same because they are linked in parallel.

The current drawn by a 100 W bulb may be calculated as follows:

P/V = I

We obtain by substituting the numbers in the equation.

I = 100 watts/220 volts; V = 100 volts/220 amps; A = 100 volts/220

In the same way, the current drawn by a 60 W bulb may be computed as follows:

I = 60 W/220 V = 60/220 A=0.