Question

A lamp can work on a 50 v mains taking 2a . What value of the resistance must be connected in series

Answer 1

Answer:

Given

V=50V

I=2A

We know that,

V=IR

So,

R=V/I = 50/2 = 25 ohm

Answer 2

Power of lamp, P = VI = 50 volts X 2 Amperes = 100 watt

since, P = V² /R

Here, P = 100 watt

V = 200 volts

R = ?

So, 100 = (200) /R²

R = 400 ohms

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