Molly Ayala
Ohmmeters are electrical instruments used for measuring electrical resistance in circuits and components. They are useful tools for electricians, mechanics, and technicians to check continuity in motors, cables, or fuses. The unit of resistance is named after German scientist Georg Simon Ohm and is expressed in ohms (Ω). Ohmmeters can be used to identify wiring setups and test the condition of motor windings by measuring the resistance between different leads. They can also help diagnose and identify the type and condition of various electrical parts, providing valuable information about the operational status and integrity of electrical systems. Modern ohmmeters are portable and some can store data on USB sticks for further analysis.
| Characteristics | Values |
|---|---|
| Definition | Electricity is a set of physical phenomena associated with the presence and motion of matter possessing an electric charge. |
| Electricity as an energy carrier | Electricity is a secondary energy source because it is produced by converting primary sources of energy such as coal, natural gas, nuclear energy, solar energy, and wind energy into electrical power. |
| Electricity in nature | Lightning, thunderstorms, and the electric eel are examples of electricity in nature. |
| Electricity in daily life | Electricity is used for lighting, heating, cooling, refrigeration, lighting, powering televisions and computers, and powering vehicles. |
| Electricity generation | Power plants, solar panels, wind farms, dams, and nuclear fuels are some ways to generate electricity. |
| Electricity transmission | Electricity is transmitted through a grid of power lines, energy stations, and transformers. |
| Electricity units | kiloWatt (kW) and kilowatt-hour (kWh) |
| Electricity in modern technology | Electricity plays a central role in modern technology, powering equipment and electronics. |
| Electricity in history | The development of the theory of electromagnetism in the 19th century led to electricity's industrial and residential application. |
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What You'll Learn
Electricity is a natural phenomenon
Electricity is indeed a natural phenomenon. It is the presence and flow of an electric charge in one direction. An electric charge can either be static or flow as an electric current.
Electricity is all around us in nature. It is present in lightning storms, and in the human body, where it is used to send messages to our muscles. Every time we move a muscle, it is the result of an electrical signal being sent from our brain to our muscles telling them to move. We have a complex system of nerves throughout our bodies that use electric signals to control everything we do.
Lightning is a form of electricity. It occurs when large amounts of electrostatic energy build up in clouds from the energy of storms. When electrically charged regions of clouds discharge their energy, a large flash of lightning is seen. Lightning strikes carry huge amounts of energy. A typical lightning strike delivers around 500 megajoules of energy.
Some animals use electricity to survive in nature. Many of these animals are found in the ocean, where some use electricity to detect objects around them, and others use it to defend themselves or hunt for food. Electric eels, for example, produce enough electricity to power a dozen 40-watt lightbulbs.
Deep inside the Earth, huge electric currents are generated from the spin of the Earth's iron core. These electric currents cause a magnetic field that extends well beyond the surface of the Earth and into outer space. The Earth's magnetic field protects the planet from the solar wind of the Sun, and enables the use of compasses.
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The electron's role
Electrons play a crucial role in electricity, which is defined as the flow of electric charge. Electrons carry a negative charge and are constantly spinning around the nucleus of an atom in shells. Protons, on the other hand, carry a positive charge and are located within the nucleus. In a balanced atom, the number of protons and electrons is equal, resulting in a neutral charge.
Electrons are crucial in the generation and conduction of electricity. When an electron is freed from an atom, it can move to another atom, creating a flow of electrons known as an electric current. This movement of electrons is what we refer to as electricity. Some materials, such as metals like copper, silver, and gold, have electrons that are loosely bound to their atoms, making them good conductors of electricity. These materials are used to create wires and other components that aid in electron flow.
In contrast, insulators are materials that prevent the flow of electrons. Examples of insulators include glass, rubber, plastic, and air. They are important in electrical systems as they help control and direct the flow of electricity.
Electricity can be generated by using electric generators, which convert kinetic energy into electrical energy. Moving magnetic fields within generators push and pull electrons, creating an electric current. Additionally, chemical reactions inside batteries can also generate electricity by creating an electromotive force that causes electrons to flow in a circuit.
It is important to note that electricity can be direct current (DC) or alternating current (AC). In DC, there is a constant flow of electrons in one direction, while in AC, the electrons move back and forth. Alternating current is more commonly used in engineering applications due to its convenience and advantages.
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Sources of electricity
The sources of electricity can be divided into three major categories: fossil fuels, nuclear energy, and renewable energy.
Fossil Fuels
Fossil fuels, including coal, oil, natural gas, and petroleum, are the dominant source of electricity globally. In 2023, about 60% of electricity in the United States was generated from fossil fuels, mainly coal, natural gas, and petroleum. Coal is currently the largest source of electricity worldwide, although some countries, like the UK, have significantly reduced their reliance on it. Other gases, such as blast furnace gas and other manufactured and waste gases derived from fossil fuels, also contribute to electricity production.
Nuclear Energy
Nuclear energy is another significant source of electricity, especially in certain countries like Sweden, Norway, France, and Iceland, which derive a large proportion of their electricity from nuclear power. In the United States, nuclear energy accounted for about 18%-19% of utility-scale electricity generation in 2023. Nuclear power plants use steam turbines to produce electricity from nuclear fission.
Renewable Energy
Renewable energy sources, such as wind, solar, geothermal, hydropower, and biomass, are becoming increasingly important for electricity generation. In 2023, renewable energy sources accounted for about 21% of total U.S. utility-scale electricity generation, with wind energy being the largest contributor, followed by hydropower and solar power. Solar photovoltaic panels and solar thermal power plants convert sunlight directly into electricity, while wind turbines harness wind energy, and hydropower plants use flowing water to spin a turbine connected to a generator. Geothermal power plants, which also use steam turbines, produced less than 1% of total U.S. utility-scale electricity generation in 2023. Biomass, which can be burned in steam-electric power plants or converted into gas, contributed about 1% to the total U.S. utility-scale electricity generation in the same year.
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Electricity's role in modern technology
Electricity is a set of physical phenomena associated with the presence and motion of matter possessing an electric charge. It is related to magnetism, and both are part of the phenomenon of electromagnetism. Electricity is a convenient way to transfer energy, and it has been adapted for numerous uses.
The development of electricity and its applications has had a profound impact on human existence. It has transformed how we power devices such as computers, home appliances, and medical equipment, which are essential for our well-being and productivity. Electricity also plays a crucial role in transportation, with the growing popularity of electric vehicles helping to reduce carbon emissions from road transport.
The Industrial Revolution witnessed dramatic advances in manufacturing and communication due to electricity. It enabled factories to operate longer hours, increased productivity, and improved lighting conditions. The invention of the "spinning jenny" and "spinning mule" revolutionised textile production, while the elevator's invention, made possible by electricity, transformed architecture and allowed for the construction of taller buildings.
Electricity has also played a significant role in lighting. The invention of the incandescent light bulb in the 1870s marked a shift from gas lighting, reducing fire hazards in homes and factories. Arc lighting, first demonstrated in 1802, and the Jablochkoff candle in 1876, further contributed to the development of electric lighting. By the late 19th century, electric lighting was being used in public spaces and began making its way into domestic settings.
In conclusion, electricity is integral to modern technology and has transformed how we power our devices, transport ourselves, manufacture goods, and illuminate our spaces. Its role in the Industrial Revolution and the subsequent economic growth underscores the importance of electricity in shaping our world.
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The history of electricity
In the year 500 B.C., Thales of Miletus discovered static electricity by rubbing fur on amber, marking the first documented instance in the history of electricity. Fast forward two thousand years, and in the 1600s, English physician and physicist William Gilbert published the first theories about electricity in his book, "De Magnete." This was followed in 1675 by English chemist and physicist Robert William Boyle, who published "Experiments and Notes about the Mechanical Origin or Production of Electricity."
The 18th century saw humans begin to harness electricity, with Benjamin Franklin's famous kite experiment in 1752 and Alessandro Volta's invention of the battery in 1800 playing pivotal roles. The development of the theory of electromagnetism in the 19th century marked significant progress, and by the end of that century, electricity's industrial and residential applications were being realized by electrical engineers. This rapid expansion in electrical technology drove the Second Industrial Revolution, with electricity's versatility transforming industry and society.
The late 19th century saw the widespread construction of generating equipment, coinciding with the popularity of urban electric tramways and the adoption of electric traction on subway systems. Hydropower also emerged as a commercial electricity generation source during this period, with the world's first central DC hydroelectric station powering a paper mill in Appleton, Wisconsin, in 1882. By 1886, there were 40 to 50 hydroelectric plants operating in the US.
The early days of home electrification were marked by the use of bare copper wires with minimal insulation, wooden sockets, switch handles, and fuse blocks. From about 1890 to 1910, knob and tube wiring was used for electric installation, with hot wires and neutral wires insulated using rubberized cloth. The 20th century witnessed the continued evolution of residential electrical services, with custom lighting installations becoming more common. Today, electricity is an essential part of modern life, powering a myriad of technologies and conveniences that we have come to rely on daily.
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Frequently asked questions
Electricity is a natural phenomenon that can be used to energize equipment and power electronics. It is the flow of electrons from one atom to another. This flow is referred to as a "current" or "electric current".
Common phenomena related to electricity include lightning, static electricity, electric heating, electric discharges, and many others. Lightning is a form of electricity that occurs when electrons move from one cloud to another or jump from a cloud to the ground. Static electricity occurs when there is an imbalance of charge on a body, usually caused by rubbing dissimilar materials together and transferring charge from one to the other.
Electricity is generated at power plants through various processes, including renewable and non-renewable energy sources. Renewable sources include wind, water, and solar power, while non-renewable sources include coal, gas, oil, and nuclear power. The electricity is then distributed through a complex system of power lines, energy stations, and transformers, forming an electrical grid.
