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Concepts Of Physics MCQ Edition [Volume 2]PhysicsAlternating Current

An electric bulb is designed to operate at 12 volts DC. If it is connected to an AC source and produces normal brightness, what is the peak voltage of the source?

Options

  1. A8.5 volts
  2. B12 volts
  3. C24 volts
  4. D17 volts

Correct answer

D. 17 volts

Step-by-step solution

For the bulb to produce normal brightness, the RMS voltage of the AC source must be equal to the DC voltage rating of the bulb. V_ rms = 12 V The peak voltage V₀ is related to the RMS voltage by the relation: V₀ = 2 V_ rms V₀ = 1.414 12 V₀ 17 V

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