Created By : Naaz Fatima

Reviewed By : Rajashekhar Valipishetty

Last Updated : Apr 10, 2023

Ohm's Law Calculator is a flexible tool that determines the relationship between voltage, current and power. All you need to do is type in the two parameters and find the unknown parameter easily in the blink of an eye.

Choose a Calculation
Voltage (V):
Current (I):

What is meant by Ohm's Law?

Ohm's Law denotes the relationship between electric current and potential difference. As per Ohm's Law Potential Difference between two point in the circuit is directly proportional to the current passing through the circuit as well as the resistance of the circuit.

Ohm's Law Formula

Ohm's Law is one of the basic laws of physics and explains the relationship between voltage, current, power. Ohm's Law Formula can be used to determine the resistance as a quotient of voltage and current. It can be written as R = V/I where R is the Resistance, V is the Voltage, I is the Current. Resistance is expressed in units Ohms and is named after the Georg Ohm the inventor of Ohms Law.

Ohms Law

Ohms Law is applicable for substances that induce power such as metals and ceramic. However, it has an exception for semiconductors, isolators. It is only valid under certain conditions such as fixed temperature.

Physicscalc.Com has got concepts like friction, acceleration due to gravity, water pressure, gravity, and many more along with their relevant calculators all one under one roof.

Voltage Formula

Finding Voltage is one of the fundamental ones in Ohms Law. We can rewrite the formula shared above to get the Voltage i.e. V= IR. You can calculate the voltage if you aware of current, resistance easily by simply substituting them in the above formula. Units of Voltage are Volts.

How to Calculate Power?

Another Value that you can determine from the grounds of Ohms Law is Power. Power is simply the Product of Voltage and Current and is given by the expression P = V*I. Units of Power are Watts.

Ohms Law for Anisotropic Materials

There is another version for Ohms Law that uses the position of electrical properties within a conductor. Conductive Materials obey the Ohms Law if the specific resistance of the materials doesn't depend on the value and applied field direction. Formula for the same is given by ρ = E / J

  • Where ρ is the specific resistance of the conductive material
  • E is the Electric Field of the Vector
  • J is the Current Density Vector

The above formula can be quite handy when you deal with anisotropic materials such as wood or graphite.

FAQs on Ohm's Law Calculator

1. What is Ohm's Law in Simple Terms?

Ohm's Law States that the current through a conductor between two points is directly proportional to voltage across two points.

2. How do you Calculate Power using Ohm's Law?

You can calculate Power using Ohm's Law equation P = V*I

3. What is Ohm's Law as an Equation?

The Formula for Ohm's Law is V = IR

4. Why is Ohm's Law not applicable to Semiconductors?

Ohm's Law is not applicable to Semiconductors since they are nonlinear devices i.e ratio of voltage to current does't remain constant with varying voltage.