Hertz

Hertz (Hz) is a unit of measurement used to express frequency, which indicates how often a repeating event occurs within a second. For example, in sound, 440 Hz means that a sound wave vibrates 440 times every second, commonly associated with the musical note A above middle C. In the context of electricity, it describes how many cycles an alternating current completes in one second. Higher frequencies mean more cycles, while lower frequencies mean fewer. Hertz is widely used in various fields, including audio, radio, and telecommunications, to quantify the oscillation rates of waves and signals.