The number of times a current completes 2 alternations of direction per second is called ___.

• A. Voltage
• B. Capacitance
• C. Frequency
• D. Resistance

Answer: (C)

In alternating current, what matters is how often the waveform repeats itself each second. That repeated pattern is called the frequency, measured in hertz. A full cycle includes a reversal from positive to negative and back again, which means there are two direction changes per cycle. So frequency is the number of complete cycles per second, not the raw amount of voltage, capacitance, or resistance. The other terms describe those different electrical properties, not how often the waveform repeats. Hence frequency is the correct term.