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Originally Posted by EricVanWyk
A small amount of current into the base allows a larger amount of current into the collector.
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Originally Posted by whcirobotics
This is where i am confused. Isnt the only one source connected to the base? When we apply just a little signal, how can a bigger flow throw collector to emitter, when we only applied it to the base? Or does the collector have something connected to it as well?
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The collector has power connected to it. The signal flowing from the base to the emitter controls the larger signal flowing from collecter to emitter.
Think of the transistor as a variable resistor. The input signal (from base to emitter) varies the resistance (from collector to emitter). This varying resistance controls the output signal according to Ohm's law.
Read the wikipedia article that Ryan linked to. It has lots of graphics and schematics.