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Q.

Two electric bulbs marked 25W-220V and 100W-220V are connected in series to a 440V supply. Which of the bulbs will fuse?

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a

Both

b

100W

c

25W

d

Neither

answer is C.

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Detailed Solution

The current upto which bulb of marked 25 W−220 V, will not fuse I1=P1 V1=25220Amp Similarly, I2=P2V2=100220 Amp  The current flowing through the circuit I=440ReffReff =R1+R2R1=V12P1=(220)225;R2=V22P2=(220)2100⇒I=440(220)225+(220)2100=440(220)2[125+1100]⇒I=40220Amp∵I1(=25220A)
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