Ohm's Law Wheel

V, I, R, P

Enter any TWO known values to calculate the rest.

Voltage (V)Volts

Current (I)Amps

Resistance (R)Ohms

Power (P)Watts

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V

I

P

R

- V

- A

- W

- ohms

The 12 Core Ohm's Law & Power Formulas

1. Voltage ($V$ in Volts): $$V = I \cdot R = \frac{P}{I} = \sqrt{P \cdot R}$$

2. Current ($I$ in Amperes): $$I = \frac{V}{R} = \frac{P}{V} = \sqrt{\frac{P}{R}}$$

3. Resistance ($R$ in Ohms): $$R = \frac{V}{I} = \frac{V^2}{P} = \frac{P}{I^2}$$

4. Power ($P$ in Watts): $$P = V \cdot I = I^2 \cdot R = \frac{V^2}{R}$$