Ohm’s Law Calculator
Calculate voltage, current, resistance, and power using Ohm’s Law with interactive circuit visualization.
Calculation Parameters
Select Calculation Type
Calculation Result
10 V
Voltage (V) = Current (I) × Resistance (R)
Ohm’s Law Formula
V = I × R
V = Voltage (Volts)
I = Current (Amperes)
R = Resistance (Ohms)
P = Power (Watts)
Circuit Visualization
Current Flow
Low Current High
Relationship Graph
Unit Converter
mA
= 0.5 A
kΩ
= 4700 Ω
Understanding Ohm’s Law
The Formula
Ohm’s Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.
V = I × R
Power Calculation
Electrical power is the rate at which electrical energy is transferred by an electric circuit. It can be calculated using various forms of the power formula.
P = V × I
P = I² × R
P = V² / R
Practical Applications
Ohm’s Law is used to determine voltage, current, or resistance in any circuit. Electricians and engineers use it daily to design circuits, select components, and troubleshoot electrical problems.