Electronic – How does a transistor act as an amplifier considering energy conservation


We all know energy cannot be formed from nothing.

So how does a bipolar junction transistor (BJT) — for example — amplify the base current by beta and outputs it to collector current?

Where is the “catch?” Is there somewhere else where were losing energy?

Best Answer

The base current in a transistor controls the collector current. The energy comes from the power supply. It is not generated within the transistor.