Umair Gaines
The term mains electricity is used to refer to the electrical power supplied to homes and businesses from a central source. The word mains in this context is believed to have originated in the 17th century and was used to refer to the means by which public utilities, such as water and gas, were distributed. The term mains electricity was first used in the early 20th century and is more commonly used in British English, while in American English, terms such as utility power, household power, wall power, line power, and grid power are more frequently used.
| Characteristics | Values |
|---|---|
| First use of the term | Early 20th century |
| Origin | The term "mains" is derived from the word "main" |
| Synonyms | Utility power, grid power, domestic power, wall power, household current, hydro (in parts of Canada), household power, household electricity, powerline, line power, wall current, AC power, city power, street power, and 120 (in the US); the mains (in the UK) |
| Nominal voltage | 230 volts |
| Frequency | 50 Hz |
| Voltage and frequency in North America | 120 V and 60 Hz |
| Voltage and frequency in Japan | 100 and 200 V with a frequency of 50 Hz in the eastern and northern parts of Honshū (including Tokyo) and Hokkaidō; 60 Hz in western Honshū (including Nagoya, Osaka, and Hiroshima), Shikoku, Kyūshū and Okinawa |
| Voltage in Europe until 1987 | 220±22 V in Germany, Austria and Switzerland; 240±14.4 V in the UK |
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What You'll Learn
- Mains electricity is a general-purpose alternating-current (AC) electric power supply
- The term 'mains' is widely understood to mean home electricity supply
- Mains electricity is delivered to homes and businesses through the electrical grid
- The voltage and frequency of electric power differ between regions
- Mains electricity is also referred to as 'utility power', 'grid power', 'domestic power', and 'wall power', among other names
Mains electricity is a general-purpose alternating-current (AC) electric power supply
The term "mains electricity" was first used in English in the early 20th century. It refers to a general-purpose alternating-current (AC) electric power supply. Mains electricity is the form of electrical power delivered to homes and businesses through the electrical grid in many parts of the world. It is used to power everyday items such as domestic appliances, televisions, and lamps by plugging them into a wall outlet.
The voltage and frequency of electric power differ between regions. For example, in much of the world, a voltage of 230 volts and a frequency of 50 Hz are standard. In North America, the most common combination is 120 V and 60 Hz. The voltage at the customer's service can be adjusted using regulating equipment at electrical substations or along the distribution line.
In the US, mains electric power is referred to by several names, including "utility power", "household power", "household electricity", "house current", "powerline", "domestic power", "wall power", "line power", "AC power", and "grid power". In the UK, it is generally referred to simply as "the mains".
The term "mains" is thought to originate from the idea of a main or centralized power supply, similar to how the word is used to describe the pipes of a centralized water supply. This usage of "mains" to describe public utilities dates back to the 17th century.
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The term 'mains' is widely understood to mean home electricity supply
The term "mains electricity" was first used in English in the early 20th century. It was initially used to refer to the electrical power supplied to homes and businesses from a central source. Over time, its usage broadened to encompass any electrical power that was not generated on-site. While the term is used in various ways across different countries, it is generally understood to refer to the electricity supplied to homes.
In the United States, mains electric power goes by several names, including "utility power", "household power", "household electricity", "house current", "powerline", "domestic power", "wall power", "line power", "wall current", "AC power", "city power", "street power", and "120 (one twenty)". Americans rarely use the term "mains power", and when they do, it typically refers to the power feed entering a house's breaker panel.
In the United Kingdom, "mains" is commonly used to refer to the electricity supply. British English speakers often use "mains" to refer to regular power from normal home outlets. The term is also used in a broader sense to describe any public utility, dating back to the 17th century.
In Canada, more than half of the electricity is hydroelectricity, and in some regions, mains electricity is called "hydro". This is reflected in the names of electricity utilities such as Hydro-Québec and BC Hydro.
Across the world, numerous mains power systems are used to operate household and light commercial electrical appliances. These systems vary in voltage and frequency, with 230 volts and 50 Hz being common in many parts of the world, while North America primarily uses 120 V and 60 Hz.
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Mains electricity is delivered to homes and businesses through the electrical grid
Mains electricity, also referred to as utility power, grid power, domestic power, wall power, household current, or hydro in some parts of Canada, is a general-purpose alternating current (AC) electric power supply. The term "mains" was first used in English in the early 20th century to describe the electrical power supplied to homes and businesses from a central source. Over time, the term took on a broader meaning, referring to any electrical power that was not generated on-site.
To ensure a stable voltage supply, electrical distribution utilities employ regulating equipment at substations or along the distribution line. Step-down transformers with automatic on-load tap changers are used to adjust the voltage ratio between transmission and distribution. In rural areas, automatic voltage regulators may be mounted on poles to account for voltage fluctuations over long distribution circuits. These regulators are autotransformers that can adjust the voltage ratio based on observed changes.
At the customer's service point, a step-down transformer provides a limited range of voltage adjustment, typically ±5% of the nominal voltage. These adjustments are made to maintain the long-term average voltage and do not impact the voltage experienced by the end-user. The electrical grid's ability to regulate voltage ensures a consistent power supply for customers, allowing them to power everyday items such as appliances, electronics, and lighting.
The electrical grid's infrastructure and voltage regulation mechanisms enable the widespread distribution of mains electricity to homes and businesses. This reliable power source has become integral to modern life, powering the devices and appliances that we use daily.
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The voltage and frequency of electric power differ between regions
The term "mains electricity" was first used in English in the early 20th century to describe the electrical power supplied to homes and businesses from a central source. Over time, the term took on a broader meaning, referring to any electrical power that is not generated on-site. The usage of the word "mains" to describe the means of distributing public utilities dates back even further, to the 17th century.
The voltage and frequency of electric power, commonly known as mains electricity, do indeed differ between regions. This variation is a result of historical development, regional standardization, and the rate at which electrical grids have evolved in different areas. The two most common frequencies are 50 Hz and 60 Hz, with approximately 40 countries using 60 Hz and the rest typically employing 50 Hz.
The voltage and frequency combinations used in different regions can vary. In much of the world, the standard combination is 230 volts and 50 Hz. However, in North America, the most common combination is 120 volts and 60 Hz. Japan is unique in that it uses both 100 volts and 50 Hz, and 100 volts and 60 Hz, depending on the region.
The choice of frequency is influenced by historical decisions made by different regions. For instance, the 50 Hz frequency was adopted by European countries, which then spread it to their colonies, including India, Australia, and many African nations. On the other hand, the United States and its allies, such as Japan and parts of South America, opted for 60 Hz. This decision was influenced by engineering considerations, as 60 Hz allowed for smaller and lighter transformers, reducing costs for large power grids.
The voltage can also vary within a country. For example, in the United States and Canada, the nominal voltage is specified as 120 V, but the actual voltage can range from 114 V to 126 V. Similarly, Japan has a dual voltage system, with 100 V and 200 V supplies available.
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Mains electricity is also referred to as 'utility power', 'grid power', 'domestic power', and 'wall power', among other names
Mains electricity is also referred to as utility power because it is generated and distributed by utility companies. These companies are often public utilities that engage in the generation and distribution of electricity for sale in a regulated market.
Grid power refers to the electricity network that delivers power from producers to consumers. Electrical grids consist of power stations, electrical substations, transmission infrastructure, and distribution networks. Grids can vary in size, from microgrids to wide-area synchronous grids and supergrids.
Domestic power refers to electricity that is generally sourced from a single source, such as a grid or generator, and is used to feed various consumers and areas, excluding live TV activities.
Wall power is a term used to describe mains electricity, as it is the power that is delivered to homes and businesses through wall outlets.
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Frequently asked questions
The word "'mains" is a widely understood synonym for home electricity supply. The term was first used in English in the early 20th century to describe electrical power supplied to homes and businesses from a central source.
Mains electricity is a term that is commonly used in British English. In the US, electricity is referred to by several names, including "utility power", "household power", "domestic power", "wall power", and "grid power", but not "mains power".
The voltage of mains electricity differs between regions. In much of the world, the voltage is 230 volts, while in North America, the most common voltage is 120 V.
