WAEC Physics 2020 Objective — Question 14

Question 14 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.

The earpiece of a telephone handset converts energy from A. electrical to sound. B. sound to electrical. C. radio wave to sound. D. sound to radio wave.

A. electrical to soundCorrect
B. sound to electrical
C. radio wave to sound
D. sound to radio wave

Explanation

The telephone works by converting sound energy into electrical energy (mouth piece, direct current electrical power, uses ring/commutators for one direction current flow). The earpiece is an A.C. generator, which converts electrical energy into sound energy; it does not have slip-rings but uses commutators.

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