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Ohm's Law Calculator

Calculate voltage, current, resistance, and power based on Ohm's Law (V=IR).

Formula

V = I × R

VIR
V = Voltage (Volts (V))I = Current (Amperes (A))R = Resistance (Ohms (Ω))
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How to Use

Step 1

Enter Two Values

Enter Two Values

Enter any two known values of voltage, current, or resistance

Step 2

Auto Calculate

Auto Calculate

The remaining value is automatically calculated

Step 3

View Results and Power

View Results and Power

Results are shown along with power consumption

Features

Bidirectional Calculation

Automatically compute the missing value from any two inputs

Power Calculation

Displays power (W) alongside V/A/Ω results

Circuit Diagram

Visual circuit diagram showing the relationship of V, I, R

FAQ

A fundamental law of electrical circuits: Voltage (V) = Current (I) × Resistance (R).