Molly Ayala
In the context of electricity, 120 refers to a voltage of 120 Volts. This is the standard voltage in the United States, where all outlets have a nominal voltage of 120V. While you may hear some people refer to 110V outlets, 120V has been the official standard since 1984 and was commonly used for many decades before that. The actual voltage in homes may vary, but 120V is the target that electricity providers aim for.
| Characteristics | Values |
|---|---|
| Nominal Voltage in the US | 120V |
| Actual Voltage Range in US Households | 107V-120V+ |
| Voltage in Europe and Africa | 220V or 230V |
| Voltage in Japan | 100V |
| Voltage in Portugal | 230V |
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What You'll Learn
- volts is the standard electricity voltage in the US
- volts is higher than the previous standard of 110 volts
- volts is the standard for many devices, like laptops and phone chargers
- volts is higher than the voltage in Europe and Africa
- volts is the standard, but actual voltage varies with distance from the transformer
120 volts is the standard electricity voltage in the US
The nominal voltage in the US has been 120V since 1984, though it was commonly used for many decades prior. The terms 110V and 120V are often used interchangeably, but 120V is the official standard. The actual voltage in homes may vary, depending on the distance from the transformer on the pole, wire type, temperature, and connection corrosion. The voltage can be several volts above 120V if the home is close to the transformer, or as low as 107V if it is further away.
It is important to be aware of voltage differences when using electronic devices from other countries. For example, devices from Japan may be rated at 100V, while Europe and Africa primarily use 220V or 230V. Using a device with a voltage that is too high can lead to issues such as short-circuiting, overheating, or device malfunction. Many electronic devices are designed to handle a range of voltages, such as laptops and phone chargers, which are often rated between 110V and 240V. However, it is always important to check the information label on any device before plugging it into an outlet with a different voltage.
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120 volts is higher than the previous standard of 110 volts
In the US, 120 volts is the standard voltage supplied to residential and commercial buildings. This standard voltage is split into two 120V conductors and one neutral conductor. When the load is applied from one 120V lead to the neutral, you get 120V. However, when the load is applied from one 120V lead to the other, the voltage combines to produce 240V. This higher voltage is used for residential kitchen ovens, clothes dryers, water heaters, and larger power tools and appliances.
The US voltage standard of 120V is higher than the previous standard of 110V. This voltage increase happened gradually, with stops at 112V, 115V, and 117V before reaching 120V. The previous standard of 110V was used to power Thomas Edison's incandescent light bulbs, which were tested in 1879. The 110V standard was also used for Edison's direct current (DC) distribution system. However, in the 1870s, arc lighting became the most popular system for street lighting. This system required higher voltages to operate than Edison's incandescent system.
The push for higher voltages also came from Tesla, who believed in the three-phase alternating current (AC) electric power system. In 1885, Tesla created Tesla Electric Light & Manufacturing, an arc lighting and manufacturing company. The higher voltage requirements of arc lighting systems contributed to the shift from 110V to 120V as the standard voltage.
Additionally, the voltage increase can be attributed to the need for more power to increase the brightness of street lights. The first electrical grids in the US were only 100 volts, and the voltage was increased to 110 volts to provide additional power for street lighting. Over time, the voltage standard continued to increase gradually, eventually reaching the current standard of 120V.
It is worth noting that the terms 110V and 120V are often used interchangeably, and you may still find older appliances rated at 110V. However, the official voltage standard in the US has been 120V since 1984, and it has been commonly used for many decades prior.
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120 volts is the standard for many devices, like laptops and phone chargers
In the US, 120 volts is the standard voltage for electrical outlets. This has been the case since 1984, although 120 volts was commonly used for many decades prior. The standardisation of 120 volts means that many devices are designed to be compatible with this voltage, such as laptops and phone chargers. These devices often have a voltage rating of 110-240 volts, allowing them to be used in other countries with different voltage standards.
The voltage in a US home may vary slightly, depending on factors such as distance from the transformer, type of wire used, temperature, and corrosion on connections. However, the voltage typically stays within a range of 114-120 volts. This slight variation in voltage is allowed for economic reasons, as maintaining a precise voltage of 120 volts would be very expensive.
It is important to ensure that any device being plugged into an outlet is rated for the same voltage. While many modern devices can handle a range of voltages, some electronics from North America may only be rated for 120 volts. Plugging a device into an outlet with a different voltage can be dangerous, potentially leading to issues such as short-circuiting, overheating, or device malfunction.
The use of 120 volts as the standard in the US can be traced back to the early days of the electrical grid in the country. When the first electrical grids were installed, they operated at 100 volts. The voltage was later increased to 110 volts to provide additional power for street lights. Over time, the standard voltage continued to increase, eventually reaching 120 volts, which has been the norm for many years.
While 120 volts is the standard in the US, other countries have different voltage standards. For example, most of Europe and Africa primarily use 220 or 230 volts. Japan, on the other hand, uses 100 volts as its primary voltage. These variations in voltage standards highlight the importance of checking the voltage requirements of devices before plugging them into outlets in different countries.
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120 volts is higher than the voltage in Europe and Africa
120 volts is the standard voltage in North America. In the US, all outlets have a nominal voltage of 120V, though you may still find older appliances that are only 110 volts. This is because when the first electrical grids were installed in the US, they were only 100 volts. The standard was then upped to 110 volts to increase the brightness of street lights.
In Europe and Africa, the standard voltage is higher, at 220-240 volts. This is also the standard in many Latin-American and Asian countries, though some of these countries use a variety of different voltages. In Europe, the allowable error range is between −6% to +6%, while in North America, it is −5% to +5%.
The difference in voltage standards can cause issues when plugging in devices from one region into outlets in the other. For example, plugging a 220-volt device from Europe into a 120-volt outlet in the US could cause the device to malfunction, short-circuit, or overheat. Many electronic devices are designed to handle a range of voltages, such as laptops and mobile phone chargers, which are often rated between 110 and 240 volts. However, it is always important to check the information label on any device before plugging it into a different voltage outlet.
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120 volts is the standard, but actual voltage varies with distance from the transformer
In the US, the standard voltage in homes is 120 volts, which has been the case since 1984. However, you may still come across older appliances that were made before this standardisation and are only compatible with 110 volts. This is because when the first electrical grids were installed in the US, they were only 100 volts.
Although 120 volts is the standard, the actual voltage in homes varies with distance from the transformer. It may be several volts above 120 if the home is close to the transformer, and as low as 107 if it is further away. The voltage also depends on factors such as the type of wire used, temperature of the wires, and corrosion on the connections between the outlet and the generator.
The standard voltage is 120 volts +/- 5% or +/- 6 volts. This means that the voltage in homes can range from 114 to 126 volts. This range is due to economic reasons, as it would be very expensive to maintain a voltage of exactly 120 volts. Almost all equipment in homes and businesses is designed to operate with a voltage that fluctuates within this range.
It is important to check that the voltage of any electronic device you are using matches the voltage of the outlet. Plugging a device into an outlet with a different voltage can cause issues such as short-circuiting, overheating, or malfunctioning. Many electronic devices are rated to handle a wide range of voltages, but it is always good to check the information label to be sure.
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Frequently asked questions
120 volts has been the official electricity standard in the US since 1984.
The first electrical grids in the US were only 100 volts. The voltage was then increased to 110V to increase the brightness of street lights. The standard has been 120V for many years now, but you may still find older appliances rated at 110V.
The nominal voltage range for 120V is +/- 5% or +/- 6 volts, which means the voltage can vary from 114V to 126V.
