Ohm's Law Calculator

How to Use Ohm's Law (V = I × R)

The Ohm's Law Calculator helps you understand the relationship between voltage, current, and resistance in electrical circuits. By entering any two values, you can see how Ohm's Law is used to solve for the third. This tool is valuable for learning the fundamentals of electronics and applying physics concepts to real-world problems.

How to Use the Ohm's Law Calculator

Select which variable to solve for: voltage, current, or resistance.
Enter the known values in the input fields, and select the appropriate unit prefix if needed.
Click Calculate to see the result, with automatic unit conversion.

Parameters Explained

Voltage (V): The electric potential difference, measured in volts (V), millivolts (mV), or kilovolts (kV).
Current (I): The flow of electric charge, measured in amperes (A), milliamperes (mA), or kiloamperes (kA).
Resistance (R): The opposition to current, measured in ohms (Ω), milliohms (mΩ), or kiloohms (kΩ).
Unit Prefix: Choose the appropriate prefix for each value (none, milli, kilo).

FAQs

What is Ohm's Law?
It states that voltage equals current times resistance (V = I × R), a cornerstone of electronics and physics.
Can I use this for both small and large values?
Yes! Use the milli/kilo prefixes to easily work with a wide range of values.
What if I'm missing a value?
Leave the field blank for the variable you want to solve for.
Is this useful for engineering and science?
Absolutely! It's widely used in electronics, physics, and engineering.
What's the difference between resistance and conductance?
Resistance is the opposition to current; conductance is its reciprocal (G = 1/R).

Description

Sharing and discussing Ohm's Law calculations can help students, engineers, and electronics enthusiasts deepen their understanding of voltage, current, and resistance. This calculator supports learning and collaboration in science and engineering education.