Question

On a bulb 60W , 120V is written. How much is its resistance ?​

Answer 1

Explanation:

resistance = V^2/ w

= 120×120/ 60

= 240..

Answer 2

R=?

P=60W

V=120V

P=VI

I= P/V

I=60/120

I=0.5A

V=120V

V=IR ( by ohms law )

So , R=V/I

R=120/0.5

R= 240

Therefore resistance of the bulb is 240