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Essential Guide to Semiconductors, The by Jim Turley

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About Electrons and Electronics

Electricity is a lot like water. It flows from one place to another, it can be shut off with appropriate valves, it can be stored for a while, and it can be used to power big mills. A steady flow of electricity is even called a current.

Like water, electricity likes to flow downhill. In electrical terms, that means it flows from wherever there is an excess of electrons to anyplace there is a shortage. Benjamin Franklin labeled these positive (+), for the “uphill” side where electricity is plentiful and negative (–) for the “downhill” side. We've used his nomenclature ever since, and you can see it marked on batteries.

Electricity even has water pressure. The amount of electricity flowing from one place to another ...

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