Mains electricity by country includes a list of countries and territories, with the
plugs,
voltages and
frequencies they use for providing electrical power to
small appliances and some
major appliances. Every country has differing rules regarding distribution of electricity for portable appliances and lighting. Voltage, frequency, and plug type vary widely, but large regions may use common standards. Physical compatibility of receptacles may not ensure compatibility of voltage, frequency, or connection to earth ground.