Ohm's Law Calculator Formula

Understand the math behind the ohm's law calculator. Each variable explained with a worked example.

Use the Ohm's Law Calculator

Formulas Used

Voltage

voltage = current * resistance

Power

power = pow(current, 2) * resistance

Variables

VariableDescriptionDefault
currentCurrent(A)2
resistanceResistance(Ω)10

How It Works

Ohm's Law

Ohm's law is the foundational relationship in circuit analysis, connecting voltage, current, and resistance.

Formula

V = I * R

where V is voltage in volts, I is current in amperes, and R is resistance in ohms. Power dissipated is P = I² * R.

Worked Example

2 amperes flowing through a 10 ohm resistor.

current = 2resistance = 10
  1. 01V = I * R
  2. 02V = 2 * 10
  3. 03V = 20 V
  4. 04P = I² * R = 4 * 10 = 40 W

Ready to run the numbers?

Open Ohm's Law Calculator