As the impedance in a simple series AC circuit gets larger, all of the following statements are valid except
A) for a given AC current, the AC voltage increases.
B) for a given AC power, the AC current decreases.
C) for a given AC voltage, the AC current decreases.
D) for a given AC voltage, the AC power increases.

Question

Quizplus · Accepted Answer

In a simple series AC circuit, if the impedance increases, for a given AC voltage, the current through the circuit decreases according to Ohm's Law (V = IR), where V is voltage, I is current, and R (or Z in AC circuits, representing impedance) is resistance. Since power (P) in an electrical circuit is calculated as P = VI (or alternatively P = I^2R or P = V^2/R), if the current decreases while the voltage remains constant, the power delivered to the circuit also decreases. Therefore, statement D is incorrect because it suggests that power increases, which contradicts the relationship between power, voltage, and current in electrical circuits.

As the Impedance in a Simple Series AC Circuit Gets