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Smart Ohm's Law Calculator
Calculate Voltage (V), Current (I), or Resistance (R).
Understanding Ohm’s Law: The Foundation of Electronics
Ohm’s Law is the most fundamental formula in electrical engineering. It states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to the resistance.
Think of electricity like water flowing through a pipe:
⚡️ Voltage (V - Volts): The water pressure pushing the water.
🌊 Current (I - Amps): The amount (flow rate) of water flowing.
🛑 Resistance (R - Ohms Ω): The size of the pipe. A narrower pipe (higher resistance) restricts the flow.
The Ohm's Law Triangle
V
I
R
Cover the value you want to calculate to see the formula.
The 3 Formulas Used in This Calculator:
To calculate Voltage: V = I × R
To calculate Current: I = V / R
To calculate Resistance: R = V / I
Engineering Pro Tip: Always ensure your units are correct before calculating. If you have milliamperes (mA) or kilohms (kΩ), convert them to standard Amps and Ohms first using our Unit Converter Tool.