Question

two lamps one rated 100 watt 220 volt and the other 60 watt 220 volt are connected in parallel to electric main supply find the current drawn by two ball from the line if the supply voltage is 220 volt​

Answer 1

We know that I=p/t

So here,

P1 = 100W , V1 = 220v

P2 = 60W , V2 = 220v

So, we can se that

I1 = P1 ÷ V1

100/220 =1/22 = 0.4545

Then ,

I2 = P2/V2

60/220 =6/22 = 0.2727

Add both the current for new current

0.4545 + 0.2727 =0.727 A

Hope that will help you..

Answer 2

Both the bulbs are connected in parallel. Therefore, potential difference across each of them will be same that is 220 V, Current drawn by the bulb of rating 100 W is given by

I=P/V

=100/220=0.4545...A

Similarly, current drawn by the bulb of rating 60 W is given by

I=P/V

=60/220=0.2727...A

∴ the total current drawn from the line =0.4545+0.2727=0.727A

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