Related to the supply of electricity, and the appropriate sockets, adapters or converters. Do not use with or instead of tag 'batteries' where [batteries] fully encompasses the electrical aspect of the question.
Different countries have different types of power plugs and different mains voltages and current frequencies. You can find information about power across the world in several places on the Web:
- Power plugs and Mains electricity by country in Wikipedia, and the map of voltage and frequency and the map of plug types by country.
- Electrical outlets by country
- International power, plugs and language
