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A device that converts sound energy into electrical energy is?

Physics
JAMB 1984

A device that converts sound energy into electrical energy is?

  • A. the horn of a motor car
  • B. an A.C. generator
  • C. a microphone
  • D. the telephone
  • E. radio waves
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Correct Answer: Option C
Explanation

The dynamic microphone is constructed with a small magnet that oscillates inside a coil attached to the diaphragm.

When a sound wave causes the diaphragm of the microphone to vibrate, the relative motion of the magnet and coil creates an electrical signal by magnetic induction.

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709