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 Ohm’s Law Calculator helps you calculate voltage (V), current (I), resistance (R), and power (P) in an electric circuit. Simply enter any two known values, and the calculator instantly computes the remaining variables.

What Is Ohm’s Law?

In 1827, Bavarian physicist Georg Simon Ohm formulated Ohm’s Law, which defines the relationship between current, voltage, and resistance in a conductor. Ohm’s Law states that the current (I) through a conductor is directly proportional to the voltage (V) across it and inversely proportional to its resistance (R).

Ohm’s Law Formula

The basic formula to calculate current is:

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

I = Current (Amperes, A)
V = Voltage (Volts, V)
R = Resistance (Ohms, Ω)

This formula allows you to calculate the current when voltage and resistance are known. You can also use our Ohm’s Law Calculator for instant calculations.

Ohm’s Law Equations

The general relationship is expressed as:

\(V = I \cdot R\)

From this, you can also solve for other variables:

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

How Our Ohm’s Law Calculator Works

You don’t need to manually perform calculations. The calculator handles everything instantly. Here’s how to use it:

Enter any two known values among Voltage (V), Current (I), Resistance (R), and Power (P).
Click the “Calculate” button.
The calculator automatically computes the remaining two values and displays the results in the SI units you selected.

Limitations of Ohm’s Law

Cannot be applied to unilateral elements such as diodes and transistors, where current does not flow proportionally in both directions.
Not valid for non-linear elements, where resistance changes with voltage or current (e.g., thyristors, electric arcs).

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

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