Hertz

A sinusoid with a frequency of 4 Hz

Hertz (or Hz for short) is unit of frequency, in cycles per second. One Hz is one cycle per second.

Common uses of Hertz include specifying sound pitch, processor clock speed (usually megahertz), and electromagnetic spectrum; such as the frequency of visible light (790–400 terahertz).

The frequency of the mains in a building, or power generated by a generator are also shown using hertz as the unit.

North America uses 60hz AC, whilst other parts of the globe use 50hz AC

SI multiples for Hertz (Hz)

Submultiples				Multiples
Value	Symbol	Name		Value	Symbol	Name
10−1 Hz	dHz	deciHertz		101 Hz	daHz	decaHertz
10−2 Hz	cHz	centiHertz		102 Hz	hHz	hectoHertz
10−3 Hz	mHz	milliHertz		103 Hz	kHz	kiloHertz
10−6 Hz	µHz	microHertz		106 Hz	MHz	megaHertz
10−9 Hz	nHz	nanoHertz		109 Hz	GHz	gigaHertz
10−12 Hz	pHz	picoHertz		1012 Hz	THz	teraHertz
10−15 Hz	fHz	femtoHertz		1015 Hz	PHz	petaHertz
10−18 Hz	aHz	attoHertz		1018 Hz	EHz	exaHertz
10−21 Hz	zHz	zeptoHertz		1021 Hz	ZHz	zettaHertz
10−24 Hz	yHz	yoctoHertz		1024 Hz	YHz	yottaHertz
Common prefixed units are in bold face.

References

• http://en.wikipedia.org/wiki/Hertz

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