JAMB - Physics (1984 - No. 35)
A device that converts sound energy into electrical energy is?
the horn of a motor car
an A.C. generator
a microphone
the telephone
radio waves
説明
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.