Volts

The unit of measure for electrical potential.

Basically, a volt is the ammount of force needed to push 1 amp through 1 ohm of resistance. So if you have a circuit that has a resistance of 500 ohm, and needs 10ma (1/100 of an amp) to power up, you need 5v to power it.

There is a typical misunderstanding about volts. Usually people see a "high voltage sign" and think that the volts can cause harm. Actually, what it is, is that everything has resistance, including your body. So the high voltage could push a large amount of current (amps) through you, and the amps is what does the harm, It is just the voltage that enables it.

SI multiples

SI multiples for Volt (V)

Submultiples				Multiples
Value	Symbol	Name		Value	Symbol	Name
10−1 V	dV	deciVolt		101 V	daV	decaVolt
10−2 V	cV	centiVolt		102 V	hV	hectoVolt
10−3 V	mV	milliVolt		103 V	kV	kiloVolt
10−6 V	µV	microVolt		106 V	MV	megaVolt
10−9 V	nV	nanoVolt		109 V	GV	gigaVolt
10−12 V	pV	picoVolt		1012 V	TV	teraVolt
10−15 V	fV	femtoVolt		1015 V	PV	petaVolt
10−18 V	aV	attoVolt		1018 V	EV	exaVolt
10−21 V	zV	zeptoVolt		1021 V	ZV	zettaVolt
10−24 V	yV	yoctoVolt		1024 V	YV	yottaVolt
Common prefixed units are in bold face.

References

• http://en.wikipedia.org/wiki/Volt

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