Question

which is having more resistance -a 220v,100w bulb or a 220v,60w bulb

Answer 1

Hi friend,

We know that

Power = V²/R

R= V²/P

(1) given,

V=220V. P=100W

R= 220×220/100

R= 484 ohm.

(2) given

V=220V. P=60W

R= 220×220/60

R=807 ohm (appx.)

:- bulb (b ) has higher resistance than bulb (a).

Hope this helped you a little!!!!

Answer 2

Answer:

The 220V, 60W bulb has more resistance.

Explanation:

Power = V^2/R

R = V^2/P

Case 1,

V = 220, P = 100W

R = 220*220/100 = 484ohm (approx.)

Case 2,

V = 220, P = 60W

R = 220*220/60 = 807ohm

So, Case 2 has more resistance.