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Current Electricity and Magnetism — Science STD 8 — Question

Maharashtra BoardEnglish MediumSTD 8ScienceCurrent Electricity and Magnetism1 Mark
MCQ
Electric doorbell:
  • A
    Always consume power.
  • ✓
    Consume power only when switch is pressed.
  • C
    Do not consume power practically and needs only starting power.
  • D
    Can't say.
✓

Answer

Correct option: B.
Consume power only when switch is pressed.
When the switch is pressed, the circuit completes and ringing begins.
Hence, electrical energy is converted to sound energy.
As the switch is released, no current flows, and no energy is consumed.

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