Bipolar Transistor

Say it, sure, though the question makes no sense.

I have used a standard linear 20 watt bipolar transistor sound amplifier at 50 Hz to boost a signal generator (about 50 Hz, 100 mV rms 0.1 milliamp) to 110 VAC, 3 watts, through a power transformer. In that case, it is certainly "power amplification", with "HiFi" accuracy. Inside the amplifier, all is powered from + and - 22 volts direct current - all the AC output power comes from that DC (which could be two batteries) - so it could also be called a "DC to AC converter". But you must take care with the meaning of "power amplification" - an electromagnetic relay with a coil current of 10 mA switching 25 amps at 240 V DC, which then closes the main breaker on a 1000 MW 60 Hz generator, is also "power amplification" - but amplification does not have to have transistors or an AC output.

And what will you call a PC then...

It takes DC and does all sorts of things and it uses transistors, even bipolar.

Gajanan Phadte