Cycles per second or hertz is the unit of measurement for which of the following?

Hertz, defined as cycles per second, specifically measures frequency, which is the number of occurrences of a repeating event per unit of time. In various contexts, such as physics and engineering, frequency indicates how often a wave, such as an electromagnetic wave, oscillates in one second. This unit is crucial in areas like communications, sound, and radiation, where understanding how often a signal occurs is essential for proper functioning and transmission of information.

The other options relate to different electrical characteristics. Voltage measures electrical potential difference, amplitude describes the magnitude of change in a wave’s signal (usually a measure of height in a wave pattern), and resistance quantifies how much a material opposes the flow of electric current. Each of these concepts operates independently of the measurement of cycles per second, further emphasizing that frequency, measured in hertz, uniquely stands out as the correct choice for cycles per second.