question_answer

Lata usually enjoyed loud music. One day her music system was not working. She get disappointed. She shared this issue with her brother Mahendra. He advised her to connect an amplifier in series with amplifier of stereosystem.

After doing that, Lata got happy.

(i) Which value is displayed by Mahendra?

(ii) Why the loudness of music system gets increased on connecting with amplifier? Write down current gain in the transistor as an amplifier.

Answer:

(i) Mahendra is caring for his sister. He has knowledge of electronic devices.

(ii) On connecting two amplifiers in series, its amplification gain gets multiplied. Hence, loudness of music system increases.

Current gain in a transistor as an amplifier, \[{{\beta }_{\Alpha C}}=\frac{\Delta {{I}_{C}}}{\Delta {{I}_{B}}}\] where, \[\Delta {{I}_{C}}=\] change in collector current and \[\Delta {{I}_{B}}=\] change in base current.