Electrical formulas for finding voltage

Electrical formulas for finding voltage -...

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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. The conversion of Watts to Amps is governed by the equation Amps = Watts/Volts
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Electrical formulas for finding voltage -...

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