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Question: If two electric bulbs have 40W and 60W rating at\(220V\), then the ratio of their resistances will b...

If two electric bulbs have 40W and 60W rating at220V220V, then the ratio of their resistances will be

A

3 : 2

B

2 : 3

C

3 : 4

D

4 : 3

Answer

3 : 2

Explanation

Solution

P=V2R⇒P = \frac{V^{2}}{R} \Rightarrow R1R2=P2P1=6040=32\frac{R_{1}}{R_{2}} = \frac{P_{2}}{P_{1}} = \frac{60}{40} = \frac{3}{2}