Question

two bulbs have the following rating (I) 40 watt at 220v and (ii)40watt at 110v.The filament of which bulbs has a higher resistance .what is the ratio of their resistance ?​

Answer 1

Explanation:

Formula is R= V^2/P. where p is power and R is Resiatance and V is voltage.

So

i)

R1= 220x220/40 = 1210 ohm

ii

R2=110x110/40=302.5 ohm.

So (i). bulb has higher resistance.

The ratio of their resistance is.

R1:R2 1210:302.5

Thank you

Answer 2

Explanation:

1210 ratio 302.5 is the answer