July 2012
Beginner
576 pages
9h 46m
English
Content preview from Complete Electronics Self-Teaching Guide with Projects
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Capacitors and Resistors in Series
4 For simplicity, consider all inputs at this time to be pure sine waves. The circuit shown in Figure 6.2 shows a sine wave as the input signal to a capacitor.
Question
If the input is a pure sine wave, what is the output? _____
Answer
A pure sine wave
5 The output sine wave has the same frequency as the input sine wave. A capacitor cannot change the frequency of the signal. But remember, with an AC input, the capacitor behaves in a manner similar to a resistor in that the capacitor does have some level of opposition to the flow of alternating current. The level of opposition depends upon the value of the capacitor and the frequency of the signal. Therefore, the output amplitude of a sine wave will be less than the input amplitude.
Question
With an AC input to a simple circuit like the one described here, what does the capacitor appear to behave like? _____
Answer
It appears to have opposition to alternating current similar to the behavior of a resistor.
6 If you connect a capacitor and resistor in series (as shown in Figure 6.3), the circuit functions as a voltage divider.
Question
What formula would you use to calculate the output voltage for a voltage divider formed by connecting two resistors in series? ...
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