In Alternating Current (AC), what does the signal do periodically?

• A. Changes amplitude
• B. Reverses direction
• C. Increases voltage
• D. Decreases resistance

Answer: (B)

In Alternating Current (AC), the characteristic feature of the signal is that it periodically reverses direction. This is a fundamental property of AC, where the flow of electric charge alternates its direction at regular intervals, typically following a sinusoidal pattern.

The periodic reversal of direction means that the current flows one way for a certain period, and then it transitions to flow in the opposite direction for an equal period. This behavior is essential for the operation of many electrical devices and power systems, as it allows for efficient transmission of electricity over long distances.

Understanding this property is crucial for studying how AC systems function, including applications in residential wiring, power generation, and electronic devices.