How current flows in transistors?

I need to understand the way current flows in transistors. Flows from Collector to Emitter?. and which is the function of the Base.

The flow is different in transistors NPN and PNP? Thanks in advance for any comment.

Reply to
markbradley2006
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Have you searched for any explanations through Google?

Here are some examples:

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(click on transistors in the left column)

Reply to
John Popelish

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