Applying AC voltage to capacitor, coil, resistor(Java applet)
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Applying AC voltage to capacitor, coil, resistor(Java applet)

A circuit having pure resistance would have the alternating current through it and the voltage across it rising and failing together. This is illustrated in applet below,which shows the sine waves for current and voltage in a purely resistive circuit having an ac source. The current and voltage do not have the same amplitude, but they are in phase

In the case of a circuit having inductance, the opposing force of the counter emf would be enough to keep the current from remaining in phase with the applied voltage. You learned that in a dc circuit containing pure inductance the current took time to rise to maximum even though the full applied voltage was immediately at maximum. Applet below shows the wave forms for a purely inductive ac circuit in steps of quarter-cycles(90).

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