Question

What are the differences between power and current amplifier?​

Answer 1

Explanation:

Current Amplifiers ( for example an Emitter Follower or CC stage) are mainly used to supply a load of low impedance like a 4 ohm or 8 ohm speaker which can not be connected to the voltage amplifiers directly without causing loading disorder in those amplifiers. They have current gain , but usually have voltage gain less than 1 , good enough for our load. Also, they have some impedance matching applications too, of matching low impedance to high.

Power amplifiers provide both the voltage gain and current gain simultaneously without any loading disorder. They usually operate with class B push-pull or class AB push pull and you will find them in the last stage of radio, stereo or TV.