How does transistor amplify current?

Question

Possible Duplicate:
I don't care how a transistor works, how do I get one to work?
Basic questions about transistor amplification

I have heard transistors are used in many electronic devices to amplify current such as in microphones which amplify the sound. I want to know how do they what do they do? How can a transistor just amplify electric current from nothing?

Similar questions have been asked previously. This one should be closed. — Leon Heller, Jan 28 '12 at 15:45
http://electronics.stackexchange.com/questions/24591/basic-questions-about-transistor-amplification — kenny, Jan 28 '12 at 16:42

Al Kepp · Answer 1 · 2012-01-28T15:54:18.430

1

Transistor needs a power source, it can't amplify a signal "from nothing".

You ask the very basics. I think you should read the first chapter of some book. For example Principles of Transistor Circuits.

Or at least Wikipedia article on transistor.

edited Jan 28 '12 at 15:54

answered Jan 28 '12 at 15:49

Al Kepp

2,971
7
26
32

How does transistor amplify current?

1 Answers1