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.
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 German physicist Georg Simon Ohm derived a formula that relates the current through a resistor to its voltage and resistance. According to Ohm’s Law:
Ohm’s Law Formula:
\(I = \frac{V}{R}\)
Where:
- \(I\) is the current in amperes (A)
- \(V\) is the voltage across the resistor in volts (V)
- \(R\) is the resistance of the resistor in ohms (\(\Omega\))
With this formula, finding the current becomes simple using our Ohm’s Law calculator.
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:
Ohm’s Law Formula for Voltage:
\(V = I \cdot R\)
In this Ohm’s Law equation, the voltage (\(V\)) is equal to the current (\(I\)) multiplied by the resistance (\(R\)).
The formula can also be rearranged to solve for current or resistance:
- Current: \(I = \frac{V}{R}\)
- Resistance: \(R = \frac{V}{I}\)
How Our Ohm's Law Calculator Works
There is no need to perform manual calculations to determine the value of voltage (\(V\)), current (\(I\)), power (\(P\)), or resistance (\(R\)). Our Ohm’s Law calculator does all the work for you within seconds. It is not only convenient but also highly efficient. Let’s take a closer 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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