Mains electricity

Mains electricity is electric power delivered to buildings through a public distribution network, typically as alternating current at a standardized voltage and frequency.

Electrical power transmission: The bulk transfer of electrical energy from generating stations to substations and distribution networks. High-voltage transmission carries power toward the local networks that supply buildings.
Voltage: The electric potential difference between two points, measured in volts. A mains voltage rating specifies the potential difference supplied to equipment.
Electrical outlet: A fixed socket that provides an electrical connection for a plug and its connected equipment. Outlets are the common points where appliances connect to building mains.
Off-grid power system: An electrical system that operates independently of a public utility grid. It supplies buildings without the public network that defines mains electricity.
Electric power distribution: The delivery of electricity from substations through local networks to end users. This final grid stage brings mains electricity from substations to buildings.
Electric frequency: The number of cycles per second in a periodic electrical signal, measured in hertz. Grid frequency is standardized and must remain within operating limits.
Electrical appliance: A device that uses electricity to perform a household or commercial function. Appliances convert mains power into heat, light, motion, or electronic operation.
Direct current: Electric current that flows in one direction rather than periodically reversing. It contrasts with the alternating current commonly delivered by public mains.
Electrical substation: A facility that switches, transforms, or regulates electrical power within an electric grid. Substations reduce transmission voltages before power enters local distribution networks.
Electrical phase: The relative position of an alternating electrical waveform within its cycle. Single-phase and three-phase supplies differ in how their alternating voltages are arranged.

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