Calculadora Lei de Ohm

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Formulas for calculating any combination of electrical units 
Principles of Electrical Engineering
Physics Formulary and Electricity Equations
 Formula Wheel  Important Formulas
Electrical engineering laws   Electronic engineering laws
Electrical formulas as circle diagram (pie chart)
V comes from "voltage" and E from "electromotive force emf". E means also energy, so let's choose V.
Energy = voltage × charge. E = V × Q. Some like better to stick to E instead to V, so do it.
Voltage V = I × R = P / I = √(P × R) in volts V          Current I = V / R = P / V = √(P / R) in amperes A
Resistance R = V / I = P / I2 = V2/ P in ohms Ω      Power P = V × I = R × I2= V2/ R in watts W
Electric voltage V = I × R      (Ohm's law formula)
Electric voltage = amperage × resistance
Please enter two values, the third value will be calculated.

 Electric voltage V  volts
Amperage I  amps 
Resistance R  ohms
V = I × R              I = V ⁄ R              R = V ⁄ I
Electric power P = I × V      (Watt's power law formula)
Electric power = amperage × voltage
Please enter two values, the third value will be calculated.

  Electric Power P  watts
Amperage I  amps 
Voltage V  volts
P = I × V              I = P ⁄ V              V = P ⁄ I

If the unit of power P = I × V and of voltage V = I · R is needed
look for "The Big Power Formulas":
Calculations: Power (watt), voltage, current, and resistance