CertiGuide to A+ (Core Hardware)

Let's look at the transistor next. If you have water flowing through a pipe, and, you put a valve in the middle of the pipe, you can control the amount of water that is flowing through the pipe by controlling the valve. A transistor works the same way.

Electricity flows in one wire and out the second wire. Applying electricity to a third wire, controls flow that acts as the valve regulating the amount of electricity that flows.

In the simplest of terms, this is how an amplifier works. A small amount of electricity is used to control a larger amount of electricity.

**Figure 13: A typical modern transistor. 30 + years ago they looked like little aluminum ‘top hats’.**

Capacitor

Diode

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CertiGuide to A+ (Core Hardware) (http://www.CertiGuide.com/aplush/) on CertiGuide.com
Version 1.0 - Version Date: December 6, 2004

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