July 2012
Beginner
576 pages
9h 46m
English
Content preview from Complete Electronics Self-Teaching Guide with Projects
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Capacitors in AC Circuits
1 An AC signal is continually changing, whether it is a pure sine wave or a complex signal made up of many sine waves. If such a signal is applied to one plate of a capacitor, it will be induced on the other plate. To express this another way, a capacitor will “pass” an AC signal, as illustrated in Figure 6.1.
Note Unlike an AC signal, a DC signal is blocked by a capacitor. Equally important is that a capacitor is not a short circuit to an AC signal.
Questions
A. What is the main difference in the effect of a capacitor upon an AC signal versus a DC signal? _____
B. Does a capacitor appear as a short or an open circuit to an AC signal? _____
Answers
A. A capacitor will pass an AC signal, whereas it will not pass a DC voltage level.
B. Neither.
2 In general, a capacitor will oppose the flow of an AC current to some degree. As you saw in Chapter 5, “AC Pre-Test and Review,” this opposition to current flow is called the reactance of the capacitor.
Reactance is similar to resistance, except that the reactance of a capacitor changes when you vary the frequency of a signal. The reactance of a capacitor can be calculated by a formula introduced in Chapter 5.
Question
Write the formula for the reactance of a capacitor. _____
Answer
3 From this formula, you can see that the reactance changes when the frequency of the input ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.