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) 2This question was posed to me in a job interview.My question is taken from Series-Series Connection of Two Port Network topic in section Two-Port Networks of Network Theory

How many incandescent lamps connected in series would consume the same

1.	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) 2This question was posed to me in a job interview.My question is taken from Series-Series Connection of Two Port Network topic in section Two-Port Networks of Network Theory
Answer» 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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