Description
fractionalResistancePerPower = thermalResistance*temperatureCoefficient; resistancePerPower additionally multiplies reference resistance.
Electrical dissipation and temperature coefficients depend on operating conditions and component reference values. A calculated loss, local temperature factor or supplied-rating margin is only part of a thermal and reliability assessment.
fractionalResistancePerPower = thermalResistance*temperatureCoefficient; resistancePerPower additionally multiplies reference resistance.
When to use this tool
Use Resistor Self Heating Power Coefficient when checking one supplied loss, temperature or power-margin term.
How to use the tool and how it works
- Enter resistance, thermalResistance, temperatureCoefficient. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read fractionalResistancePerPower, resistancePerPower. Use the output convention below.
Require nonnegative resistance and thermalResistance. fractionalResistancePerPower = thermalResistance*temperatureCoefficient; resistancePerPower additionally multiplies reference resistance.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| resistance | Electrical resistance; use ohms with SI electrical inputs. | Required. Finite number; minimum 0. |
| thermalResistance | Temperature rise per watt; use K/W with SI inputs. | Required. Finite number; minimum 0. |
| temperatureCoefficient | Fractional resistance change per temperature unit, not ppm unless converted. | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| fractionalResistancePerPower | Fractional Resistance Per Power | Required. Finite number. |
| resistancePerPower | Resistance Per Power | Required. Finite number. |
{
"input": {
"resistance": 100,
"thermalResistance": 20,
"temperatureCoefficient": 0.001
},
"output": {
"fractionalResistancePerPower": 0.02,
"resistancePerPower": 2
}
}Limitations and assumptions
- Use K/W and fractional resistance change/K for 1/W and ohm/W. This local linear coefficient is not a self-consistent heating solution or power-rating assessment.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use manufacturer ratings, thermal paths, derating and transient conditions for a complete practical design.
References
Similar or alternative tools
- Electricity: Resistor Delta Temperature Coefficient Step
resistance = referenceResistance*factor; relativeChange = factor-1.
- Resistor Junction Temperature Sensitivity
resistance = referenceResistance*factor; derivative = referenceResistance*temperatureCoefficient.