Current Electricity - Result Question 76

81. Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be

[2003]

(a) 50 watt, 200 watt

(b) 50 watt, 100 watt

(c) 100 watt, 50 watt

(d) 200 watt, 150 watt

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Answer:

Correct Answer: 81. (a)

Solution:

  1. (a) Power $\propto \frac{1}{\text{ Resistance }}$

In series combination, resistance doubles.

Hence, power will be halved.

In parallel combination, resistance halves.

Hence, power will be doubled.