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← Electric Current and Its Effects
GK QUESTION#2982

A light bulb working on a 18V battery draws a current of 3A. What will be the resistance of the bulb?

  1. A6 ΩCorrect answer
  2. B2 Ω
  3. C4 Ω
  4. D3 Ω
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Answer

A. 6 Ω

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Explanation

At the stated operating point, R = V/I = 18/3 = 6 Ω. This calculation does not assume that a filament bulb has the same resistance at every temperature or voltage.

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