Otis Singleton
Electricity is a natural phenomenon that occurs throughout nature and is integral to modern technology. It is the flow of electric charge, which can be positive or negative, and is usually measured in amperes. Electric current can flow through conductors but not insulators, and it is what powers our electronic gadgets. The study of electricity dates back to ancient times, but significant progress was made in the 19th century, with the development of the theory of electromagnetism. This led to the widespread use of electricity in industry and residences, driving the Second Industrial Revolution. Electricity is now used in various sectors, including transport, heating, lighting, and communications, and it is what enables electrification, which involves converting energy-consuming devices or systems from non-electric sources of energy to electricity.
| Characteristics | Values |
|---|---|
| Definition | Electricity is a natural phenomenon that occurs throughout nature and takes many different forms. Electricity is defined as the flow of electric charge. |
| History | The study of electrical phenomena dates back to ancient times, with the development of the theory of electromagnetism in the 19th century marking significant progress. The 19th century also saw the emergence of electric technologies such as telegraphy, sound transmission by electricity, and the invention of the telephone. |
| Science | Electricity is related to magnetism, both being part of electromagnetism. Electric charge can be positive or negative, and its movement creates an electric current, typically measured in amperes. Electric potential is measured in volts and represents the work done to move a charge within an electric field. |
| Applications | Electricity powers modern technology, including cell phones, computers, lighting, and transportation. It is also integral to heating, communications, and computation, playing a central role in industrial and residential applications. |
| Electrification | Electrification involves converting energy-consuming devices or systems from non-electric sources to electricity. Electric technologies, such as electric vehicles and appliances, enable electrification for a cleaner energy future. |
| Technology Adoption | Utilities, vendors, municipalities, and states are working to overcome barriers and encourage the adoption of electrification technologies. Strategies include customer education, grants, and rebates to support the transition to electric alternatives. |
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What You'll Learn
Electricity's role in transport
Electricity is integral to applications spanning transport, heating, lighting, communications, and computation, making it the foundation of modern industrial society.
The first EVs were one of the earliest types of automobiles produced and sold in the United States. However, they initially struggled to gain traction due to limitations in EV travel range, the lack of EV battery charging infrastructure, and the widespread availability of gasoline and diesel fuel.
In recent years, there has been a renewed interest in EVs due to concerns about the environmental impact of internal combustion engines. EVs offer several advantages over traditional internal combustion engines, including improved fuel economy and reduced emissions. The electric motor in an EV uses a smaller internal combustion engine, allowing it to maintain power while reducing fuel consumption. Additionally, the battery pack in an EV powers auxiliary loads such as headlights, wipers, and the radio, further reducing the burden on the engine.
BEVs, in particular, are considered zero-tailpipe emission vehicles because they do not directly emit any criteria pollutants or greenhouse gases during operation. They rely solely on electricity stored in their on-board battery packs for all power needs, including driving, heating, and cooling the cabin. The travel range of BEVs has also improved significantly, with new BEVs offering a battery range of approximately 114 to 450 miles.
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Electric lighting
Electricity is integral to modern technology, with applications in transport, heating, lighting, communications, and computation. The development of the theory of electromagnetism in the 19th century marked a significant turning point, leading to electricity's industrial and residential application.
Incandescent lamps produce light by passing an electric current through a filament, heating it to a white heat. The first incandescent lamp was invented by an English scientist, John Wanamaker, in 1860. However, it was not until the 1920s that commercially produced incandescent light bulbs became available, with the work of inventors like Warren de la Rue, William Greener, and Thomas Edison paving the way for their development.
Gas-discharge lamps, such as fluorescent lamps, produce light by sending an electric arc through a gas. In fluorescent lamps, electricity flowing through a glass tube containing mercury vapour or argon under low pressure causes the gases to give off ultraviolet energy. The inside of the tubes are coated with phosphors that give off visible light when struck by ultraviolet photons. Arthur Compton conducted successful experiments with fluorescent lighting in 1934, and the first prototype fluorescent lamp was built the same year.
LED lamps produce light by a flow of electrons across a band gap in a semiconductor. The first practical LED was created in 1962.
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Electric communication technologies
The study of electricity dates back to ancient times, with the Ancient Egyptians describing electric fish as the "protectors" of all other fish in texts dating from 2750 BCE. However, theoretical understanding progressed slowly until the 17th and 18th centuries, and the development of the theory of electromagnetism in the 19th century marked a significant turning point. This led to electricity's industrial and residential application, driving the Second Industrial Revolution and making electricity the foundation of modern industrial society.
The electrical principles behind these technologies had first been demonstrated by Davy in 1802, but practical problems slowed their development. It wasn't until the late 19th century that arc lamps, which had been improved upon with the invention of the Jablochkoff candle in 1876, began to appear in public places. The development of incandescent lighting in the 1860s by John Wanamaker provided a more reliable and convenient form of lighting.
The 20th century saw further advancements in electric communication technologies, with the first solid-state device, the "cat's-whisker detector", being used in radio receivers. The first working transistor was invented in 1947, followed by the bipolar junction transistor in 1948. Power-line communication (PLC) technology also emerged, allowing data to be carried on a conductor that is also used for electric power transmission or distribution. This technology has been used for home automation, remote control of lighting and appliances, and Internet access, often called broadband over power lines (BPL).
Today, electric communication technologies have transformed the way we interact and communicate with each other, with electronic communication methods such as messaging, voice call, email, social media, video chat, and blogging becoming commonplace. These technologies have made global communication accessible to people with no physical movement required, and have had a significant impact on work areas and society.
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Electrification technologies
Electric vehicles are a key example of electrification technologies. The transportation sector is witnessing a growing trend of electrification, with an increasing number of electric cars, buses, and trucks on the road. Companies are electrifying their fleets of medium- and heavy-duty vehicles, and some cities are working towards electrifying public transportation, school buses, airports, and shipyards.
In addition to transportation, the building sector is also undergoing electrification. New residential and commercial buildings are now equipped with electric appliances, including heat pumps, water heaters, and induction cooktops. Existing buildings are being retrofitted with electric technology to improve energy efficiency and flexibility.
However, there are challenges to the adoption of electrification technologies. One significant barrier is the high upfront cost of new technology, which can be a burden for both residents and businesses. Additionally, unfamiliarity with new technology and a lack of trained technicians to install and service it can hinder its widespread adoption. To overcome these obstacles, utilities, vendors, municipalities, and states are working together to educate customers about the long-term benefits of electrification and provide financial incentives to offset upfront costs.
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Electric power industry
The electric power industry supplies electricity to businesses and homes. Electricity is usually sold by the kilowatt-hour (3.6 MJ), which is the product of power in kilowatts multiplied by the running time in hours. Electric utilities measure power using electricity meters, which keep a running total of the electric energy delivered to a customer.
Electricity is integral to modern life and is used for residential, commercial, industrial, and transportation purposes. It is also central to many modern technologies, serving in electric power and electronics. The electric power industry uses various technologies to generate electricity, including fossil fuels, nuclear fuels, and renewable energy sources. Power plants that burn fuels typically use steam boilers, combustion turbines, or both. Steam boilers burn fuel to heat water and produce steam, which is then channelled through a turbine to generate electricity. Combustion turbines burn fuels to create exhaust gases, which spin a turbine to generate electricity.
Some power plants, such as nuclear power plants, do not burn any fuel to generate electricity. Instead, they use nuclear reactions to produce steam, similar to steam boilers. Other renewable energy sources for electricity generation include wind turbines, hydropower, solar thermal power plants, and solar photovoltaic (PV) panels. As more renewable energy power plants are connected to the electric grid, energy storage technologies, such as batteries and pumped storage, become more important for balancing supply and demand.
The development of electricity as a technology has a long history. The study of electrical phenomena dates back to ancient times, with the ancient Egyptians describing electric fish in texts from 2750 BCE. However, theoretical understanding progressed slowly until the 17th and 18th centuries. The 19th century marked a significant period of development, with the discovery and development of telegraphy, telephony, and radio. The invention of the "cat's-whisker detector" in the 1900s and the first working transistor in 1947 further advanced electrical technology.
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Frequently asked questions
Electricity is a natural phenomenon that occurs throughout nature and takes many different forms. It is the movement of electric charge, which is usually measured in amperes.
Technology refers to the application of scientific knowledge for practical purposes. It often involves the use of machines or devices created to solve problems or perform tasks.
No, electricity and technology are not the same. Electricity is a form of energy that can be converted into other forms, such as motion. Technology, on the other hand, encompasses the devices and machines that utilize electricity, as well as the processes and knowledge behind their creation and operation.
Electricity plays a central role in powering modern technology. It is used in various sectors, including transport, heating, lighting, communications, and computation. Technology enables the utilization of electricity through devices such as electric vehicles, appliances, and power grids, while electricity provides the energy required for their functioning.
