LUQMAN ISMATEngiVault
Contact
ENGiVAULTEngineering workspace
← All calculators

Electrical

DC Resistor Current and Power

Enter values in the stated units. Example inputs are provided to help you explore the method.

Inputs

Results

Your results will appear here after calculation. Changing an input clears the previous result.

Method & assumptions

  1. For an ideal ohmic resistor, I = V/R and P = VI = V²/R.
  2. Example: 12 V across 100 Ω gives 0.12 A and 1.44 W. Reversing voltage reverses current but leaves dissipated power positive.
  3. Assumes constant DC voltage and resistance. Does not model resistance changing with temperature, reactive AC loads, source impedance or nonlinear devices.
  4. Calculated dissipation is not a selected component rating; consult the component’s thermal derating and operating limits.
  5. Source: https://openstax.org/books/university-physics-volume-2/pages/9-5-electrical-energy-and-power

Sources