How work amplifier?

Answer 1

amplifier consists of active components like transistor fet etc,.

for example transistor, it produces high output is common emitter configuration.

when u give weak signal to the base of the transistor and the output is taken in collector terminal(amplitude of the weak is increased, so the output is high ) its known as amplifier

Answer 2

Amplifiers main purpose is to improve or to amplify electronic devices and musical equipment such as TV, radio, and electric Guitars. Most amplifiers are often used on big performances like concerts and live shows.