Which one of the following statements concerning an ac circuit is true?
A)The current and voltage are in phase for a capacitor in an ac circuit.
B)On average, the power dissipated by a resistor in an ac circuit is zero.
C)For a resistor in an ac circuit, the current and voltage are 90° out of phase.
D)Inductors in an ac circuit offer little opposition to current at high frequencies.
E)When only resistance is present in an ac circuit, voltage and current are in phase.

Question

Quizplus · Accepted Answer

When only resistance is present in an AC circuit, the voltage and current are in phase. For a capacitor in an AC circuit, the current and voltage are 90° out of phase, while inductors offer high opposition to current at high frequencies. On average, the power dissipated by a resistor in an AC circuit is not zero, as it depends on the phase difference between the current and voltage.

Which One of the Following Statements Concerning an Ac Circuit