Question

Two bulbs have the following rating :

a) 40w , 200v
B) 20 w , 110v

what is the ratio of their resistance

Answer 1

Hey mate


here is your answer :-



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Given :

power (p) = 40w

voltage (V1) = 200v

power (P2) = 20w

voltage (v2) = 110v

Formula to be used :

p = VI

= v^2/R

R = V^2/P

USING FORMULA FOR BOTH BULBS , WE GET

R1/R2 = V1^2/V2^2 * p2/P1

= 200^2/110^2* 20/40

= 2/1

R1 : R2 :: 2:1


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I HOPE IT HELP YOU ✌✌
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Answer 2

Explanation:

The Answer refer in Attachment

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Thank you