What is the term for the number of times per second an alternating current completes a positive to negative cycle?

Frequency is the measurement of how many complete cycles (from positive to negative and back) an alternating current completes in one second. The standard unit of measurement for frequency is the Hertz (Hz), where 1 Hz equals exactly one cycle per second. While the other terms are related to waves or signals, they describe different properties. 'Phase' refers to the timing relationship between two signals. 'Speed' usually refers to the velocity at which the wave travels (such as the speed of light). 'Pulse rate' is a term typically used for digital or pulsed DC signals rather than continuous alternating current.