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The hertz (symbol Hz) is the SI derived unit of frequency, which is expressed in terms of oscillations per second (s-1, 1/s).

For example, red light has a frequency of about 4.6×1014 Hz. The unit is named in honor of the German physicist Heinrich Rudolf Hertz who made some important contributions to science in the field of electromagnetism.

Alternating current electric power is supplied at either 50 Hz or 60 Hz depending on the standard in the country. Power systems that have differing frequency can only be connected by using a HVDC link.


1 terahertz (THz) = 1012 Hz = 1,000,000,000,000 Hz
1 gigahertz (GHz) = 109 Hz = 1,000,000,000 Hz
1 megahertz (MHz) = 106 Hz = 1,000,000 Hz
1 kilohertz (kHz) = 103 Hz = 1,000 Hz

In older writings, the equivalent term cycle per second (cps) is seen.

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