Ohm's Law Calculator
Circuit Parameters
Results
Ohm's Law
V = IR
I = V/R
R = V/I
Power Laws
P = VI
P = I²R
P = V²/R
Reference Guide
Voltage (V)
The electrical pressure or potential difference between two points in a circuit.
Unit: Volts (V)
Current (I)
The flow rate of electric charge through a conductor.
Unit: Amperes (A)
Resistance (R)
The opposition that a material offers to the flow of electric current.
Unit: Ohms (Ω)
Power (P)
The rate at which electrical energy is transferred in a circuit.
Unit: Watts (W)
Common Applications
- Circuit design
- Power consumption analysis
- Component selection
- Battery life calculation
Tips
- Enter any two values to calculate the others
- Check power ratings of components
- Consider temperature effects
- Use appropriate safety margins