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?

For the lamp one: Power P1 = 100 W and Potential Difference V = 220 V
Therefore,
𝐼1=𝑃1/𝑉=100220=0.455 𝐴
For the lamp two: Power P2 = 60 W and Potential Difference V = 220 V
Therefore,
𝐼2=𝑃2/𝑉=60/220=0.273 𝐴
So, the net current drawn from the supply is given by
𝐼=𝐼1+𝐼2=0.455+0.273=0.728 𝐴

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