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Question: Three light bulbs of 40 W, 60 W and 100 W are connected in series with 220 V source. Which one of th...

Three light bulbs of 40 W, 60 W and 100 W are connected in series with 220 V source. Which one of the bulbs will glow brightest

A

40 W

B

60 W

C

100 W

D

All with the same brightness

Answer

40 W

Explanation

Solution

In series PConsumed∝Brightness∝1PRatedP_{Consumed} \propto \text{Brightness} \propto \frac{1}{P_{Rated}}