Constants library

4 values, each with its units, its uncertainty, and where it came from.

Electromagnetic 4

f_{60} = 60\ \text{Hz}

HzNominal 60 Hz AC power frequency across North America, held within about ±0.05 Hz by grid operators balancing generation against load.

f_{50} = 50\ \text{Hz}

HzNominal 50 Hz AC power frequency used across Europe, Asia, Africa and Oceania, regulated to roughly ±0.05 Hz in normal grid operation.

V_{120} = 120\ \text{V}

VNominal 120 V RMS at North American outlets, with ANSI C84.1 allowing roughly 114–126 V at the point of utilisation under normal service.

V_{230} = 230\ \text{V}

VNominal 230 V RMS single-phase supply under IEC 60038, the harmonised European figure that replaced the old 220 V and 240 V standards.