By David Groth, Jarret W. Buse, David Groth et al

ISBN-10: 0782128025

ISBN-13: 9780782128024

This is the entire info you want to organize for the most recent A+ certification in a single unmarried quantity! This research advisor offers complete, in-depth assurance of either the middle and the DOS/Windows modules. sincerely centred and arranged, the fabric covers the entire professional CompTIA examination targets. The CD includes the customized A+ test-prep software that simulates the test-taking surroundings, and hundreds and hundreds of questions make certain your knowing of the cloth provided.

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Tolerance bands indicate how well the resistor holds to its rated value. As we mentioned in the preceding example, if there is no fourth band, the resistor has a tolerance of plus or minus 20%. That’s pretty bad. In electronics, you usually need things to be very close (like a tolerance of less than 5%). A silver band indicates a 10% variation, and a gold band indicates a 5% variation. Remember, though, this range indicates the maximum variation—it’s possible that the resistor might be right on with its resistance value.

Although hex numbers are easily recognized by the fact that they combine letters and numbers, it is also common to see a subscript 16 or an h after the number to designate it as a hex number. 4 Decimal, Binary, and Hex Equivalents Decimal Number Binary Number Hex Number 0 0000 0 1 0001 1 2 0010 2 3 0011 3 4 0100 4 5 0101 5 6 0110 6 7 0111 7 8 1000 8 9 1001 9 10 1010 A 11 1011 B 12 1100 C 13 1101 D 14 1110 E 15 1111 F The hexadecimal system works as follows: A binary number is broken up into groups of 4 bits.

When we say “chip” in the computer business today, we often mean the package that the silicon wafer is housed in, not the wafer itself. From now on, when we use the word chip, we are referring to the IC. There are several types of ICs, but we will cover only the most commonly used types. Dual Inline Package The most common package for an IC is the Dual Inline Package, or DIP. DIPs contain two rows of pins and are usually black with markings on top indicating their manufacturer and purpose. 6 shows a Dual Inline Package IC.

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A+ CompTIA Complete Certification Study Guide by David Groth, Jarret W. Buse, David Groth et al


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