# Encyclopedia Magnetica

Encyclopedia of magnetics and electromagnetics.

hz

# Hz

 Stan Zurek, Hz, Encyclopedia-Magnetica.com, {accessed 2019-03-25}

Hz or hertz - a unit of frequency, reciprocal of cycle or period.

According to the SI terminology, hertz is a coherent derived unit, because it can be derived from the base unit of second by raising to the power of -1. Hertz can only be applied to period phenomena.1)

50 Hz sine waveform has 20 ms cycle, and 100 Hz sawtooth waveform has 10 ms cycle

by S. Zurek, E. Magnetica, CC-BY-3.0

In older publications the phrase cycles per second (or c.p.s.) was used to denote frequency, and it was a unit synonymous with hertz so that 1 cps = 1 Hz.2)3)

## Calculator of frequency and time

 $f = 1 / t$ (Hz) frequency f = (mHz) (Hz) (kHz) (MHz) (GHz) period t= (ns) (us) (ms) (s)
 $t = 1 / f$ (s) period t = (ns) (us) (ms) (s) frequency f= (mHz) (Hz) (kHz) (MHz) (GHz)