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Resistors in an AC Circuit

Resistors in an AC Circuit

Just as a reminder, consider this figure, which shows an AC voltage applied to a resistor and a graph of voltage and current versus time. The voltage and current are exactly in phase in a resistor. There is no frequency dependence to the behavior of plain resistance in a circuit:

AC Voltage in a Resistor

When a sinusoidal voltage is applied to a resistor, the voltage is exactly in phase with the current—they have a \(\text{0º}\) phase angle.

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