1.

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

Answer»

Solution :CURRENT drawn by 1ST lamp rated 100W at 220V
`I_1=P_1/V=100/220=5/11A`
and current drawn by 2nd lamp rated 60W at 220V
`I_2=P_2/V=60/220=3/11A`
In PARALLEL arrangement the total current `I=I_1+I_2=5/11+3/11+8/11A=0.73A`


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