Extension Cord Power Loss Calculator

How Extension Cord Power Loss works

The calculation starts with loss = I²R. Extension Cord Power Loss uses Load current, Round-trip cord resistance to report Cord loss.

In the loaded Extension Cord Power Loss case, cord loss equals 60.48 W. Preserve the baseline before changing a value. For required impedance, open Current-Limiting Impedance Calculator.

Inputs for Extension Cord Power Loss

Load current and Round-trip cord resistance belong to Extension Cord Power Loss. Keep source units with load current. Remaining box volume belongs in the separate Junction Box Fill worksheet.

The preset case is instructional rather than prescriptive. Enter the applicable electrical data.

Load current

Example entry: 12 A.

Round-trip cord resistance

Example entry: 0.42 Ω.

When Extension Cord Power Loss feeds another worksheet, transfer Cord loss at full precision. Preserve ampacity, fault duty, voltage loss, thermal margin, and permitted fill. Round load current after the Extension Cord Power Loss transfer.

For Extension Cord Power Loss, source Load current from route measurements, conductor data, protective-device ratings, and fault studies. Record conductor material, insulation class, ambient temperature, and installation method. Round-trip cord resistance needs matching conditions.

Reading the Extension Cord Power Loss result

This output represents Extension Cord Power Loss.

Finish the selection with standard sizes, operating limits, and transient review.

Use Cord loss to use Extension Cord Power Loss to calculate cord loss. Compare it with ampacity, fault duty, voltage loss, thermal margin, and permitted fill. Cord loss does not override another Wiring and Protection limit.

For Extension Cord Power Loss, preserve Load current and cord loss under the same conductor material, insulation class, ambient temperature, and installation method record before final use.

Measurement and units

Treat these results as planning arithmetic; conductor and protective-device selection must follow the applicable electrical code and equipment instructions. Check prefixes on load current.

Keep the same electrical reference points across saved cases. For required conductor area, use Wire Gauge Calculator.

Limits of this calculation

Coiled cords and warm surroundings reduce cooling. For wire resistance, open Wire Resistance Calculator.

Extension Cord Power Loss omits effects absent from its entered values.

A useful Extension Cord Power Loss comparison

Record cord loss before testing a different load current value.

Document the alternate load current source.

In Extension Cord Power Loss, save the Extension Cord Power Loss result at 12 A load current, then calculate again at 13.2 A. The corresponding cord loss values are 60.48 W and 73.18 W. Extension Cord Power Loss holds round-trip cord resistance fixed; check Wiring and Protection equipment limits.

In Extension Cord Power Loss, label Load current by operating state. Keep cord loss cases separate for conductor material, insulation class, ambient temperature, and installation method.

For Wiring and Protection, test Cord loss at nominal and limiting load current values. Keep the Extension Cord Power Loss cases separate.

Questions about Extension Cord Power Loss