Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

RMS Current (A) (A)

Required number input.

On Resistance (Ω) (Ω)

Required number input.

Estimate resistive power-module conduction loss as RMS current squared times hot on-state resistance; use the operating-temperature resistance. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Conduction Loss (W) (W)

The resulting conduction loss (w) returned as a number.

• Power-supply ripple, hold-up, inrush, efficiency, and loss calculations depend on line range, load transient, switching mode, capacitor bias and ESR, rectifier conduction interval, control limits, temperature, and component tolerance. Safety, stability, EMI, and fault behavior require separate verification.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Copper Loss

  Compute resistive winding or conductor loss as I²R from RMS current and resistance at the relevant operating temperature. Output is watts; AC skin and proximity effects are not included unless already reflected in the supplied resistance.

• ESR Power Loss

  Compute capacitor ESR power dissipation as RMS ripple current squared times equivalent series resistance.

• Conduction Loss

  Compute MOSFET conduction loss as the square of RMS drain current times RDS(on).