Aircrew Fundamentals Block 3 Practice Test

In the context of alternating current (AC) circuits, a cycle refers to a series of changes in voltage and current that return to their starting points. This means that in one complete cycle, the current flows in one direction, then reverses and flows back in the opposite direction before returning to its original state.

The definition emphasizes the periodic nature of AC, where the waveform (typically sinusoidal) goes through positive and negative peaks before resetting. This cyclical pattern is crucial for understanding how AC systems function, as it defines the operating characteristics of the circuit, including frequency and phase relationships.

Understanding this concept is essential in various applications, from power generation to electronics, where alternating current is typically used. Each cycle is a fundamental aspect that influences how circuits are designed and analyzed, affecting everything from signal processing to power delivery.