Ohm's Law

Compute V, I, R, or P from any two known values.

Example

You enter

You get

Details, formula, and sources

Ohm's Law: V = I * R; P = V * I. Derived identities for the missing two from any pair.

Classical electromagnetism; physical fact. Identities verified against IEEE 141 (Red Book).

No code citation required (physical fact). Reference texts free at archive.org and university OCW.

Estimate. AHJ and licensed electrician govern. Verify against the NEC edition adopted in your jurisdiction.

Field names used by the API: V, I, R, P

Details, formula, and sources

Ohm's Law: V = I * R; P = V * I. Derived identities for the missing two from any pair.

Classical electromagnetism; physical fact. Identities verified against IEEE 141 (Red Book).

No code citation required (physical fact). Reference texts free at archive.org and university OCW.

Estimate. AHJ and licensed electrician govern. Verify against the NEC edition adopted in your jurisdiction.