Ohms Law Calculator

Ohms Law Calculator

Enter any two values, and the calculator will instantly determine the voltage, current, power, or resistance of the electrical circuit

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

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

Note: Just enter any two values.

Voltage(V):

V ▾

Current(I):

A ▾

Resistance(R):

Ω ▾

Power(P):

W ▾

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 formulated by Bavarian physicist Georg Simon Ohm. It is a fundamental law that defines the relationship between current (I), resistance (R), voltage (V), and power (P). Specifically, Ohm’s Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the conductor and inversely proportional to its resistance (R).

Ohm’s Law Formula:

The formula derived by Georg Simon Ohm is:

Current (I) in Amperes (A) is equal to the Voltage (V) in volts divided by the Resistance (R) in ohms (Ω):

\(I = \frac{V}{R}\)

Using this formula, finding the current becomes straightforward. You can also use our Ohm’s Law Calculator for quick calculations.

Ohm’s Law Equation:

Ohm’s Law expresses the relationship between voltage, current, and resistance in a simple equation:

\(V = I \cdot R\)

This means the voltage (V) across a conductor is equal to the current (I) flowing through it multiplied by the resistance (R) of the conductor.

From this equation, you can also solve for current or resistance as needed:

Current: \(I = \frac{V}{R}\)
Resistance: \(R = \frac{V}{I}\)

How Our Ohm's Law Calculator Works?

You don’t need to manually perform mathematical calculations to determine voltage (V), current (I), resistance (R), or power (P). Our Ohm’s Law Calculator does it all in seconds. It is simple, efficient, and user-friendly! Here’s how it works:

The calculator has four fields: Voltage (V), Current (I), Resistance (R), and Power (P).
Enter any two known values along with their SI units.
Click the “Calculate” button, and the calculator will automatically compute the remaining two values.

The results will be displayed in the SI units you selected before calculation.

Limitations of Ohm's Law:

Ohm’s Law cannot be applied to **unilateral elements** such as diodes and transistors, which do not have the same voltage-current relationship in both directions.
Ohm’s Law is not valid for **non-linear elements**, where the current is not exactly proportional to the applied voltage. This means the resistance changes with different voltages or currents. Examples include thyristors and electric arcs.

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EN	DA	DE
FI	NO	ID
RU	TR	PL
PT	AR	FR
ES	IT	JA
CS	KO