Ohm's Law & Watt's Law Calculator
Electrical Properties
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Electromotive Potential
Measured in Volts, is represented by the letter V (or E)
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Current
Measured in Amperes, is represented with the letter I
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Resistance
Measured in Ohms, is represented by the letter R (or the Greek letter Ω)
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Power
Measured in watts, is represented by the letter W
Ohm's Law
States the relationship between voltage, current and resistance. Given the relationship between these three elements, once you know any two of them, it is possible to calculate the third.
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V = IR
Volts = Amps x Ohms
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I = V/R
Amps = Volts / Ohms
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R = V/I
Ohms = Volts / Amps
Watt's Law
Watt's Law is similarly useful in figuring out the relationship between power, voltage and current.
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W = VI
Watts = Volts x Amps
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V = W/I
Volts = Watts / Amps
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A = W/V
Amps = Watts / Volts
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