Ohms Law Calculator - Calculator See


Ohms Law Calculator

Solve electrical circuits using Ohm’s law circle: calculate any two values from Voltage (V), Current (I), Resistance (R), and Power (P).

Calculator Inputs

V
Potential difference.
A
Electric current.

Calculated Results

Circuit Resistance (R)
12.00 Ohms (Ω)
Electrical Power (P) 1,200 Watts (1.20 kW)
Supply Voltage (V) 120.00 Volts
Current Flow (I) 10.00 Amperes
Values calculate live as you adjust inputs.

About Ohms Law Calculator

Applies Ohm’s fundamental law (V = I × R) and Joule’s law (P = V × I) to calculate resistance, power dissipation, voltage drop, and amperage.

What is Ohms Law Calculator?

Applies Ohm’s fundamental law (V = I × R) and Joule’s law (P = V × I) to calculate resistance, power dissipation, voltage drop, and amperage.

How to Use This Calculator

  1. Enter voltage and current.
  2. Instantly review calculated resistance in Ohms and power dissipation in Watts.

The Mathematical Formula & Variables

R = V / I; Power = V * I

Step-by-Step Worked Example

Scenario: 120V supply drawing 10A current.

  1. Resistance = 120 / 10 = 12.00 Ohms (Ω).
  2. Power = 120 * 10 = 1,200 Watts (1.20 kW).

Result: R = 12 Ω | P = 1,200 W

Frequently Asked Questions

What are the four fundamental electrical parameters?

Voltage (V in Volts), Current (I in Amps), Resistance (R in Ohms), and Power (P in Watts).