# REACTANCE AND IMPEDANCE - CAPACITIVE

### Chapter 4 REACTANCE AND IMPEDANCE { CAPACITIVE

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### Lessons In Electric Circuits Volume II – AC Book

• Chapter 4REACTANCE ANDIMPEDANCE – CAPACITIVEContents 88,4.1 88,AC 88,resistor 88,circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79 90,4.2 90,AC 90,capacitor 90,circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81 94,4.3 94,Series 94,resistor-capacitor 94,circuits . . . . . . . . . . . . . . . . . . . . . .85 99,4.4 99,Parallel 99,resistor-capacitor 99,circuits . . . . . . . . . . . . . . . . . . . . .90 102,4.5 102,Capacitor 102,quirks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93 104,4.6 104,Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .954.1AC resistor circuitsRETETIIRERET = ERI = IR0°IRFigure 4.1: Pure resistive AC circuit: voltage and current are in phase.If we were to plot the current and voltage for a very simple AC circuit consisting of a source anda resistor, (Figure 88,4.1) it would look something like this: (Figure 89,4.2)Because the resistor allows an amount of current directly proportional to the voltage across it atall periods of time, the waveform for the current is exactly in phase with the waveform for the voltage.We can look at any point in time along the horizontal axis of the plot and compare those values of79