> For the complete documentation index, see [llms.txt](https://docs.ifreeq.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ifreeq.com/general-knowledge/electricity.md).

# Electricity

* [History of domestic electricity](https://docs.ifreeq.com/general-knowledge/electricity/history-of-domestic-electricity)
* [Plug & socket types](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world)
* [Plug, socket & voltage by country](https://docs.ifreeq.com/general-knowledge/electricity/plug-socket-and-voltage-by-country)
* [World map showing the spread of plug types](https://docs.ifreeq.com/general-knowledge/electricity/world-map-showing-the-spread-of-plug-types)
* [Useful information for travellers](https://docs.ifreeq.com/general-knowledge/electricity/useful-information-for-travellers)
* [Three-phase electric power (industrial applications only)](https://docs.ifreeq.com/general-knowledge/electricity/three-phase-electric-power-industrial-applications-only)