A+ Complete Study Guide by David Groth PDF

By David Groth

ISBN-10: 0782128025

ISBN-13: 9780782128024

I handed my three hundred sequence A+ examination the 1st time after learning this booklet and the perform assessments. now not that the three hundred sequence has been retired, yet that I handed my examination on June 29, 2007; the day ahead of the three hundred sequence tests have been to retire!
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At any one instant, a dimmer switch can have a setting almost anywhere between on and off. This is similar to an analog electrical signal, which may be on or off or somewhere in between. Vacuum Tubes—The Old Days… Today’s computer components are the products of previous generations of trial and error. Each generation improves upon the previous era. 1). 1 A vacuum tube The vacuum tube is really nothing more than a switch. A small voltage at one pole switches a larger voltage at the other poles on or off.

8); the SIPs are plugged into corresponding holes or mounts in a circuit board. SIPs are not used much anymore, primarily because of the tendency of the pins to break. SIPs were often used for memory modules. 9). PGA stands for Pin Grid Array, describing the array of pins used to connect the chip to the circuit board. ZIF stands for zero insertion force, which describes how easy it is to place a chip in this kind of socket. It is a type of socket that works with PGA chips to allow them to be mounted on a circuit board.

Also, this material is not on the test, so if you don’t want to read it, or if you already know it, feel free to skip ahead to the next section in this chapter. Electricity Defined Let’s start by defining electricity. Electricity is the flow of electrons from one molecule of a substance to another. In order for electrons to flow, an element must have free electrons. Elements such as copper, iron, and zinc have free electrons, thus making them good conductors of electricity. All computer components use electricity to function.

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A+ Complete Study Guide by David Groth

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