Jawapan

2016-10-08T19:12:35+08:00
Supaya bunyi dpt didengari kot
dia mostly bende yg menguatkan gelombang elektrik dan tukarkan kepada bunyi
mcm pembesar suara
faham. thanks
2016-10-08T20:39:36+08:00
An amplifier is an electronic device that increases the voltage, current, or power of a signal. Amplifiers are used in wireless communications and broadcasting, and in audio equipment of all kinds. They can be categorized as either weak-signalamplifiers or power amplifiers.

http://whatis.techtarget.com/definition/amplifier