Skip to content
PanelCalc
Sign in Open calculators
Browse: Calculators, Guides, About
All calculators Guides About Methodology

Resistor Power Dissipation

Dissipation from any two of V/I/R, 2x rating guide, temperature rise estimate and annual waste. 6 inputs, 5 outputs with grouped results.

Inputs

Electrical

Across the resistor.

Through it; 0 solves from V/R.

Ohms.

Thermal and cost

Heatsink C per W; 30 free air typical.

For waste cost.

Blended rate.

Result

Dissipation (V x I)
Waiting for calculation.
Cross-check (I2R)
Waiting for calculation.
Min rated (2x rule)
Waiting for calculation.
Waste cost / yr
Waiting for calculation.
Temp rise estimate
Waiting for calculation.
Screening calculation only. Verify against NEC articles cited on the page and the equipment nameplate; the authority having jurisdiction governs.

Related calculators

Calculator

Coil and Braking Energy Calculator

Stored inductive energy, braking dump energy, average dump power and resistor sizing hint. 5 inputs, 4 outputs with grouped results.

Outputs: Stored coil energy · Energy per stop · Average dump power

Open calculator

Calculator

Control Panel Heat Loss Calculator

Six heat sources, natural dissipation from enclosure area, cooling need and fan/air-con decision. 8 inputs, 5 outputs with grouped results.

Outputs: Total heat load · Natural dissipation · Active cooling need

Open calculator

Calculator

Enclosure Ventilation Fan Sizer

Cooling airflow for control panels: CFM from internal watts and allowed rise, with filtered-fan derate. 4 inputs, 3 outputs with grouped results.

Outputs: Base airflow · Required with filter · Needs air conditioner (1=yes)

Open calculator

Workspace

Keep the assumptions with the result.

Save this calculation to return to the inputs, result, and report from your private workspace.

Sign in to save Create account

Sign in or create an account to save this calculation.