Question

What will be resistance of lamp if it has 100w and 220v?

Answer 1

Given,

P= 100W

V= 220V

We know,

P= VI

I= 100/220

I = 10/22

I= 5/11 A

Now,

V = IR

R= 220÷5/11

R= 220×11/5

R= 44×11

R= 484 Ohm

Hope it helps...

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Answer 2

Power and potential diffrence are given apply the formula given to find resistance