ASVAB Practice Test

Which of the following is a type of resistance in an AC transformer circuit?

1. Conductance

2. Impedance

3. Inductance

4. Reactance

The correct answer is: Impedance

In an AC transformer circuit, the primary consideration regarding opposition to current flow is primarily characterized as impedance. Impedance is a complex quantity that combines both resistance and reactance, and is essential for analyzing AC circuits. Resistance refers to the opposition to the flow of direct current and is measured in ohms, while reactance describes the opposition to alternating current due to capacitors and inductors. However, when discussing an AC transformer, it's the total opposition to current flow—combining both resistance and reactance—that is referred to as impedance. Impedance plays a crucial role in the performance of an AC transformer circuit, affecting how much current flows for a given voltage and how the circuit responds to different frequencies. This distinction is vital for understanding the behavior of AC circuits and transformers specifically.