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How many incandescent lamps connected in series would consume the same total power as a single 100 W/220 V incandescent lamp. The rating of each lamp is 200 W/220 V?

(a) Not possible

(b) 4

(c) 3

(d) 2

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Right answer is (d) 2

Explanation: In series power = \(\frac{1}{P}\)

Now, \(\frac{1}{P} = \frac{1}{P_1} + \frac{1}{P_2}\)

 = \(\frac{1}{200} + \frac{1}{200}\)

Or, P = \(\frac{200}{2}\) = 100 W.

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