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ohms law Calculator

Ohms Law Calculator

Enter any two of the following values and the calculator will readily calculate the voltage, current, power, and resistance of the electrical circuit.

Voltage(V) = Current(I) * Resistance(R)

Power(P) = Voltage(V) * Current(I)

Note: Just enter any two values.










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The ohms law calculator calculates power, current, resistance, and voltage flowing through a circuit in a specified direction. Enter any two values and get instant calculations for all the variables in ohm’s law equation.

Well, before knowing more about our ohms law calculator, let’s we tell you about what is ohm’s law.

What Is Ohms Law?

In 1827, the mathematical law of electric current was derived by the Bavarian physicist Georg Simon Ohm. It is the most fundamental law that defines the relationship between the current (I), resistance (R), voltage (V), and power (P). More specifically, ohm’s law defined that the current (I) through a conductor between two points is directly proportional to the voltage (V), and is inversely proportional to the resistance (R).

Ohm’s Law Formula:

The Bavarian physicist Georg Simon Ohm derived a formula in which the resistor’ current (I) in amps (A) = (is equal) to the resistor’s voltage (V) in volts divided by the resistance R in ohms (Ω):

Ohm’s law formula is stated as:

Current (I) = (Voltage,(V))/(Resistance,(R)) in Amperes, (A)

How to find current becomes easy with our simple ohms law calculator concerning formula for current.

Ohm’s Law Equation:

Ohms law derived that the amount of current (I) through a metal conductor in a circuit is directly proportional to the voltage (V) impressed across it, for respective temperature. Georg Simon Ohm expressed his discovery in the form of a simple ohm’s law equation that describes how voltage, current, and resistance interrelate:

V = IR

In this ohms law equation – voltage (V) is equal to the current (I) multiplied by resistance (R). Well, using this ohm’s law equation manipulate into two variations, solving for current (I) and resistance (R), respectively:

I = E/R and R = E/I

How Our Ohm’s Law Calculator Works?

There is no need to stick on certain mathematical calculations to determine the value of voltage (V), current (I), power (P), and resistance (R). Our ohms calculator does all for you within a couple of seconds. Our ohms law calculator is not only convenient to use, but it also works efficiently! Let’s take a look!

  • In the above ohms law calculator, you can find four fields of Voltage (V), Current (I), Resistance (R), and Power (P), respectively
  • You just have to enter any two of these values concerning their SI units
  • Once you selected two values and their SI units, then you just have to press the calculate button to get the remaining two values

As mentioned above, you will get your outcomes concerning the SI units that you select before calculating!

Limitations Of Ohms Law:

  • Keep in mind, ohm’s law cannot be applied to unilateral networks – These networks contains unilateral elements including diode, transistors, etc., means these elements do not have same voltage-current relation for both directions of current
  • Optimistic studies reveal that the ohm’s law is not applied to non-linear elements – these are the elements that do not have current exactly proportional to the applied voltage, which means the resistance value of these elements changes for different values of voltage and current. The examples of the non-linear elements are thyristor, electric arc, etc


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