Calculadora Lei de Ohm

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