Arizona Low Voltage Contractor Exam 2025 – Complete CR-67 Practice Test

Alternating Current (AC) is characterized by the periodic reversal of direction of current flow. This means that in an AC circuit, the flow of electrical charge changes direction at regular intervals, which is typically defined by the frequency of the AC signal (measured in Hertz). For example, in standard household electricity in the United States, the current alternates direction 60 times per second (60 Hz).

Because of this inherent property, the statement that AC always flows one way and then the other is accurate. The continuous switching of direction is what differentiates AC from Direct Current (DC), which flows in a single direction. Understanding this fundamental concept is vital in the context of low voltage communication systems, as many devices operate on AC power for their functionality. Recognizing the behavior of AC is essential for installation, troubleshooting, and ensuring safe practices when working with electrical systems.