Q121 / 200 · NEET 2004 · Physics

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be:

  • A
    60 watt
  • B
    180 watt
  • C
    10 watt
  • Correct answer
    D
    20 watt

Solution

The resistance of each bulb is $\frac{V^2}{P}$ $=\frac{(200)^2}{60} \Omega$ when three bulbs are connected in series then equivalent resistance is $\frac{3 \bullet(200)^2}{60}$ $\therefore \quad$ Power $P=\frac{V^2}{R_{e q}}=20 \mathrm{~W}$

Hence, the correct answer is option: 'D'.

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