New PDF release: A+ Complete Study Guide

By David Groth

ISBN-10: 0782128025

ISBN-13: 9780782128024

I handed my three hundred sequence A+ examination the 1st time after learning this e-book 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 checks have been to retire!
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Today’s computer components use digital signals, which are signals that contain values that are discrete. Analog signals, on the other hand, change values over time. Consider the difference between two common types of light switches: a standard light switch and a dimmer switch. The standard light switch has only two values: on and off. As a rule, at any one time the switch will be in either one position or the other. This is similar to digital electrical signals, which have discrete values (like on and off).

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. For example, say you have the color sequence brown, green, orange, silver. The resistance would be indicated as 15 × 1,000, or 15,000Ω (you can also express it as 15kΩ)—and it may very well be that this particular resistor is able to resist currents up to precisely that strength.

Then, in the Calculator’s display box, type in the decimal number you want to convert. To convert the number to binary, click the button next to the word Binary. To convert it to hex, just click the button next to Hex. For example, if you have the binary number 01001101 (decimal number 77), you would break this 8-bit word into two groups. The first group (0100) would translate to 4 in hex, and the second group (1101) translates to D. So, this 8-bit binary number would convert to the two-digit hex number 4D.

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A+ Complete Study Guide by David Groth


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