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# How to: Convert between Watts, Amps and Volts.

The formula for finding wattage is very simple.

Watts = Volts x Amps

So lets say you have a 1000 watt stero system in your car. You wanna know how many amps that its sucking down.

Amps = Watts / Volts

Since a car battery is 12 volts: 1000W / 12V = 83.3 Amps.

Ok now lets say Uncle Jimbo has put in a 30 Amp breaker for his massive year round Christmas light display that his neighbors are threatening to sue him over. You want to find out how many watts of lights that Jimbo can put up before it blows the breaker.

Watts = Amps x Volts

Since house current is 120 volts: 30A x 120V = 3600 Watts or 3.6 Kilowatts
(Yipes Jimbo!)

Lets say a PSU puts out 17 amps and 204 watts on a certain rail. You want to find the voltage.

Volts = Watts / Amps

So 204W / 17A = 12 Volts.

I hope you guys find this FAQ helpful
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Nice...rep+
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Its always true minus inefficencies
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wow.....I actually never knew that
Yeh nice one.
Maybe you should put the formula in as P = V I and Watts Volts And Amps are the units.

cheers
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Very good, but it would be nice if you further defined what Volts, Amperes, and Watts were. I know what they are, but you should include it in your FAQ.
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I dont know that much more about them except that "volt" was named after some guy whos last name was Volta.
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Well, a Watt is one Joule of energy per second.

-The term "Volt" is named after Alessandro Volta, who invented the electric battery.
-"Watt" is named after James Watt, who helped develop the steam engine.
-"Joule" comes from James Prescott Joule, who studied heat and laid the foundation for the laws of thermodynamics. Also probably where the Prescott core got it name, and it is a fitting name, since the Prescott produces so much heat, which is what he studied.
-"Amp" or "Ampere" is named after AndrÃƒÂ©-Marie AmpÃƒÂ¨re, one of the main discoverers of electromagnetism.

Hope that fills you in, and it is a nice FAQ.
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V=IR is pretty usefull too. (Volts=current*resistance)

Plus, Watts is just the unit for power, Volts are the unit for potential difference, and Amps are the unit for current.

Might make it easier if people know Watts are the same as power, and amps is current ect.

Nevertheless nice FAQ+
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It's a decent FAQ, but for newbies like me who are still confused about electrical terms like these maybe you could define each a bit more (if you yourself ever find that out), or atleast link to/copy another source that explains it.
THEN I'll give you a rep point
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