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Question

# 30 bulbs are connected in a series. If one bulb is fused and the remaining 29 bulbs are joined in a series and connected to the same supply, the light in the room will be:

A
increased
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B
decreased
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C
remain same
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D
none
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Solution

## The correct option is A increasedSuppose a single bulb has resistance R and the supply is of V volts, then in CASE-1Equivalent resistance of 30 such bulbs in series will be 30×R=30RThus power in this case will be P1=V2Resistance=V230R ........................ (1)in CASE-2Equivalent resistance of 29 such bulbs in series will be 29×R=29RThus power in this case will be P2=V2Resistance=V229R ........................ (2)We can see that P2>P1so the light in the room will get increased.

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