Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Mains electricity, typically a higher voltage AC waveform used to deliver electrical power to households. In North America 120V, 60Hz, in most European countries 230V, 50Hz. What most people will plug appliances into.

Mains electricity, typically a higher voltage AC waveform used to deliver electrical power to households. In North America 120V, 60Hz, in most European countries 230V, 50Hz. What most people will plug appliances into.

Because it is so ubiquitous, many electrical devices are designed to plug directly into wall outlets, even if internally they convert that power to a more convenient voltage -- often , , or .

In turn, for efficiency reasons or compatibility with the above devices or both, many electrical systems deliver electrical power at standard mains voltage and more-or-less standard frequencies and waveforms, converting from power distribution systems or from "12 V" power.

history | excerpt history