Ohm's Law & Power Calculator
Calculate voltage, current, resistance, and power using Ohm's Law with any two known values
About this calculator
This Ohm's Law & Power Calculator helps you quickly determine voltage, current, resistance, and power in electrical circuits by entering any two known values. Based on the fundamental relationships V=IR and P=VI, this tool automatically calculates the missing parameters, making it essential for electrical engineers, technicians, students, and DIY enthusiasts. Whether you're designing circuits, troubleshooting electrical problems, or learning electronics fundamentals, this calculator eliminates manual computation errors and saves valuable time in your electrical calculations.
How to use
Enter any two known values from voltage (V), current (I), resistance (R), or power (P) into their respective input fields. The calculator will automatically compute and display the remaining two unknown values using Ohm's Law equations. Clear results instantly appear, showing all four electrical parameters for your circuit analysis.
Frequently asked questions
What is Ohm's Law and how does it work?
Ohm's Law states that voltage equals current times resistance (V=IR). It describes the relationship between voltage, current, and resistance in electrical circuits.
Can I calculate power with this Ohm's Law calculator?
Yes, this calculator determines power using P=VI, P=I²R, and P=V²/R formulas, providing complete electrical analysis with any two input values.
What units should I use for the calculations?
Use volts for voltage, amperes for current, ohms for resistance, and watts for power. The calculator works with standard electrical units.