one way is a voltage regulator, another is a DC to DC converter
Volts direct current eg battery As opossd to Vac wich is volts altinating current eg mains supply
It stands for "12 volts, direct current".
The SI unit of EMF (electromotive force) in a direct current circuit is Volts. The circuits current is measured in ampere's
For radios 6 volts, for cars 12 volts, for large vehicles 24 volts, for submarines 220/440 volts.
In the category fuses and wiring it stands for Direct Current Volts
A car cigarette lighter uses 12 volts direct current. Car electrical systems use 12 volts direct current verses the 120 volt alternating current use in most household situations.
"Power (/Watts) = Current (/amps) * Potential Difference (/volts)" Therefore, power = 7 * 12 = 84 W
5 volts Direct Current 600 milliampers
DC known as direct current, usually 12 volts, as opposed to AC known as alternating current which is what you find in your home or business, which is usually 110 or 220 volts.
To calculate the power in watts, you will also need to know the current in amperes. The formula to calculate power is P (watts) = V (volts) x I (amperes). If you only have the voltage (30 volts) and not the current, you cannot determine the power in watts.
This is the voltage you get out of household receptacles in North America. It stands for 110 volts alternating current. Contrast this with a car battery which is rated as 12 vdc or 12 volts direct current.
I can say that 24VAC means 24 volts alternating current. 24VDC @ 1A means 24 volts direct current delivered at 1 ampere. So the difference I suppose would be: 1. Alternating current VS. Direct current 2. X Amperes(VAC) VS. 1 Ampere (VDC)