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Telephones send information through wires in form of ________

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Telephones send information through wires in form of ________

(a) radio signals

(b) electrical signal

(c) electromagnetic waves

(d) microwaves

This question was addressed to me in an international level competition.

My doubt is from Source of Information in division Elements of Communication System of Analog Communications

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Best answer
Right option is (b) electrical signal

Easiest explanation: A telephone converts sound waves into electrical signals which are suitable for transmission over long distances, where it is converted to sound waves again, through a transducer. The essential components of a telephone are a microphone which acts as a transmitter and an earphone which acts as a receiver.

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