SECTION 15What Is an Amplifier?

WATER IS ALWAYS A GREAT ANALOGY. A small amount of power on the handle allows a very large amount of power to flow from the source through the amplifier.


Lesson 49Transistors as Amplifiers and Defining Current

So, what is an amplifier? It takes a small signal and makes it bigger. Signals are made of both voltage and current.

The definition from is very simple.

am·pli·fy—verb. 1. To make larger or more powerful; increase. 2. To add to, as by illustrations; make complete. 3. To exaggerate.

4. Electronics—To produce amplification of or to amplify an electrical signal.

am·pli·fi·er—noun. 1. One ...

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