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Community reference, not engineering advice. Follow the NEC as adopted locally and the authority having jurisdiction.
Electrical
Formulas, calculators and quick references for electrical work.
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Ohm’s law
Enter any two of voltage, current and resistance.
0 ▲ · Tasker · Oct 15, 2026
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Voltage drop
Approximate drop for copper or aluminum conductors, single- or three-phase.
0 ▲ · Tasker · Oct 15, 2026
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Electrical formulas
Ohm’s law, power, series and parallel resistance, and US conductor colors.
0 ▲ · Tasker · Oct 15, 2026