Oklahoma Locksmith Practice Exam

What type of current does an AC meter measure?

1. Direct current

2. Alternating current

3. Pulsed current

4. All types of current

The correct answer is: Alternating current

An AC meter is specifically designed to measure alternating current, which is the flow of electric charge that periodically reverses direction. This type of current is the standard for household electrical systems and a wide range of applications because it is efficient for transporting electricity over long distances. The alternating nature of the current means that it varies its magnitude and direction in a sine wave pattern, which is precisely what AC meters are calibrated to track and quantify. They provide readings in volts, amps, and watts based on this alternating characteristic, making them essential tools for electricians and technicians working with AC circuitry. In contrast, direct current (DC) flows in a single direction and would require a different type of meter, known as a DC meter, to measure properly. While some specialized meters may measure both AC and DC, an AC meter itself focuses solely on alternating current, making it the appropriate choice in this context. Pulsed current, which involves rapid changes in direction, is also not what AC meters specifically measure.