An electricity and magnetism problem by Rajesh Kumar
Electricity and Magnetism
Level
2
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 supply line if the supply voltage is 220 V ?
8/11
6/4
220/12
4/11
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1 solution
(R1 = V^2/100) & (R2 = V^2/60) Now finding R-Total = (R1*R2/R1+R2) Now Dividing V-Supply (220v) by R-Total to get ("8/11" = 0.7272727272727272727272773)