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Ohm's law and power calculatorUS · en-US

Choose one of six independent input pairs and derive the remaining base-SI quantities.

Ideal steady DC resistance only; verify ratings and electrical rules separately.

Ready.

How to use it

Use this calculator for educational ideal-resistor relationships where V = IR and P = VI apply directly.

  1. Choose the two known quantities and enter positive values in volts, amperes, ohms, and watts.
  2. Calculate to derive all four base-SI values.
  3. Check component ratings and applicable electrical rules separately before real-world work.

Worked example

Input
Voltage 12 V · current 2 A
Output
Resistance 6 Ω · power 24 W

Every pair is solved from the same Ohm's-law and electric-power identities.

Method and definitions

  • The six pairs are V/I, V/R, V/P, I/R, I/P, and R/P using V = IR and P = VI.
  • Square-root forms solve V and I when resistance and power are known.

Limits and edge cases

  • Only ideal steady DC resistive circuits are covered; no AC phase, reactance, tolerance, or temperature behavior is modelled.
  • This is not wire sizing, protection selection, component certification, or electrical-code compliance advice.

Privacy

All input and output stays in this tab. Rigula does not upload, store, or include it in a share URL.