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Two electric bulbs marked 25W-220V and 100W-220V are connected in series to a 440V supply.

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

(a) 100W 

(b) 25W

(c) neither 

(d) both

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1 Answer

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Best answer

When these two bulbs are connected in series, the total resistance is

Thus the bulb 25W will be fused, because it can tolerate only 220V while the voltage across it is 352V.

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