In a purely resistive AC circuit, what is the phase angle between voltage and current?

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Multiple Choice

In a purely resistive AC circuit, what is the phase angle between voltage and current?

Explanation:
Voltage and current are in phase in a purely resistive AC circuit. This means their waveforms rise and fall together, reaching maximum and zero values at the same times. In phasor terms, the impedance is purely real (Z = R) with an angle of 0 degrees, so the voltage and current phasors point in the same direction. The phase angle between them is therefore 0 degrees. If a reactive element were present, the current would either lead or lag the voltage by 90 degrees (pure inductive: current lags; pure capacitive: current leads). A phase difference of 180 degrees would imply an inverted relationship not produced by a simple resistor, and would require non-passive behavior.

Voltage and current are in phase in a purely resistive AC circuit. This means their waveforms rise and fall together, reaching maximum and zero values at the same times. In phasor terms, the impedance is purely real (Z = R) with an angle of 0 degrees, so the voltage and current phasors point in the same direction. The phase angle between them is therefore 0 degrees.

If a reactive element were present, the current would either lead or lag the voltage by 90 degrees (pure inductive: current lags; pure capacitive: current leads). A phase difference of 180 degrees would imply an inverted relationship not produced by a simple resistor, and would require non-passive behavior.

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