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Two electric bulbs marked 25W - 220Vand 100W - 220V are connected inseries to a 440Vsupply. Which of thebulbs will fuse?A) 25 WB) BothC) 100 WD) Neither |
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Answer» Resistances of both the bulbs are R1=V^2/P1 = 220^2/25 R2 = V^2/P2 = 220^2/100 Hence R1gt ; R2R1gt ; R2 When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V devides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse. |
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