Ohm's Law Calculator
Instantly calculate voltage, current, resistance, and power with our advanced Ohm's Law calculator. Perfect for students, engineers, and electronics enthusiasts.
How to use:
- Enter any two values (Voltage, Current, Resistance)
- Click "Calculate" to find the missing values
- Use sliders to adjust values dynamically
Ohm's Law Calculator
Visualize Electrical Relationships
Interactive charts to help you understand Ohm's Law principles and relationships
Power Distribution
Voltage vs Current
Resistance Comparison
How Ohm's Law Calculator Works
Our advanced tool makes electrical calculations simple and accurate
Enter Values
Input any two of the four parameters: voltage (V), current (I), resistance (R), or power (P).
Calculate
Click the calculate button to instantly compute the missing values using Ohm's Law formulas.
Visualize & Analyze
View interactive charts to understand the relationships between electrical parameters.
Why Use Our Ohm's Law Calculator
Advanced features for professionals, students, and electronics enthusiasts
Multiple Calculation Modes
Calculate voltage, current, resistance, or power with equal ease. Supports both DC and AC circuits.
Real-time Visualization
Interactive charts help you understand the relationships between voltage, current, and resistance.
Interactive Sliders
Adjust values dynamically with sliders to see how changes affect circuit parameters instantly.
Mobile Friendly
Works perfectly on all devices - desktop, tablet, or smartphone. Calculate on the go!
Frequently Asked Questions
Everything you need to know about Ohm's Law and our calculator
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points. It is represented by the formula: V = I × R, where V is voltage in volts, I is current in amperes, and R is resistance in ohms.
Power (P) in watts can be calculated using variations of Ohm's Law:
P = V × I
P = I² × R
P = V² / R
Our calculator automatically computes power when you enter any two electrical parameters.
Ohm's Law applies to AC circuits with resistive loads. For circuits with reactive components (inductors or capacitors), impedance must be considered instead of resistance. Our calculator includes an advanced mode for AC circuit calculations.
Our Ohm's Law calculator provides precise calculations based on standard electrical formulas. Results are accurate to 6 decimal places for professional applications. The tool has been tested by electrical engineers to ensure reliability.
Yes, resistance can be calculated using the formula R = V / I. Simply enter the voltage and current values in our calculator, and it will automatically compute the resistance.
Understanding Ohm's Law: The Complete Guide
Master electrical calculations with our comprehensive Ohm's Law resource
Introduction to Ohm's Law
Ohm's Law, named after German physicist Georg Simon Ohm, is one of the fundamental principles of electrical engineering. Published in 1827, this law describes the relationship between voltage, current, and resistance in an electrical circuit. Understanding Ohm's Law is essential for anyone working with electronics, electrical systems, or studying physics.
The Ohm's Law Formula
The basic formula of Ohm's Law is V = I × R, where:
- V = Voltage (in volts)
- I = Current (in amperes)
- R = Resistance (in ohms)
This formula can be rearranged to solve for any of the three variables:
- I = V / R (Current = Voltage ÷ Resistance)
- R = V / I (Resistance = Voltage ÷ Current)
Power Calculations
Electrical power (P) in watts can be calculated using variations of Ohm's Law:
- P = V × I (Power = Voltage × Current)
- P = I² × R (Power = Current² × Resistance)
- P = V² / R (Power = Voltage² ÷ Resistance)
Practical Applications
Ohm's Law has countless practical applications:
- Circuit design and analysis
- Troubleshooting electrical problems
- Selecting appropriate resistors
- Calculating power consumption
- Designing safe electrical systems