Current Electricity 5 Question 18

18. A 25W and a 100W bulb are joined in series and connected to the mains. Which bulb will glow brighter?

(1979)

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Solution:

  1. In series current is same. Therefore, from the relation P=i2R, a bulb having more resistance consumes more power or glows brighter. 25W bulb has more resistance R=V2P compared to 100W bulb. Hence, it will glow brighter.

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