Physics & Engineering

Ohm's Law

V, I, R — leave one blank (two filled).

V (volts) I (amps) R (ohms)

Educational estimates only. Not medical, legal, tax, or financial advice.

Guide: Ohm's Law

What it does

Algebraic solver for DC Ohm’s law relationships.

How to use it

Enter two of V, I, R; leave the third blank.

Formula

V = IR; I = V/R; R = V/I; P = VI.

Example

2 A through 10 Ω → 20 V.

FAQs

Does this apply to AC?

For resistive loads at RMS values, similar; reactive circuits need impedance.

Resistor power rating?

Ensure P = VI is within the resistor’s wattage rating.

Series vs parallel?

Ohm’s law applies per element; combine resistors first for network totals.