Wiktor Wise
Electric generators are devices that convert mechanical or chemical energy into electrical energy. They do not create electrical energy but rather force the movement of electric charges in their windings through an external circuit. Generators are useful during power outages and prevent disruptions in daily activities and business operations. They can also be used as a primary power source in areas where a local electrical grid is unavailable. Electricity storage is essential to balance fluctuations in electricity supply and demand, and it can be stored in various ways, including pumped hydroelectric, compressed air, flywheels, and batteries.
| Characteristics | Values |
|---|---|
| How electricity is stored | Electricity is stored during periods of high production and low demand and is released during low production and high demand. |
| Electricity storage technologies | Pumped hydroelectric, compressed air, flywheels, batteries, thermal energy storage |
| Electricity storage capacity in the US | Over 25 gigawatts as of March 2018 |
| Electricity storage benefits | Economic, reliability, environmental, operational efficiency, reduced brownouts, enabling more renewable energy |
| How generators work | Convert mechanical or chemical energy into electrical energy |
| Types of generators | Steam turbines, combustion (gas) turbines, hydroelectric turbines, wind turbines, electromagnetic generators |
| Generator components | Engine, alternator/genhead, fuel system, voltage regulator, cooling and exhaust systems, lubrication system, armature, stator, commutator, brush assembly |
| Generator applications | Backup power during outages, primary power source in areas without a local electrical grid, powering entire buildings, industrial use |
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What You'll Learn
Generators convert energy
The modern-day generator works on the principle of electromagnetic induction, discovered by Michael Faraday in 1831. Faraday found that moving a magnet inside a coil of wire induces an electric current to flow through the wire. This led to the design of the electromagnetic generators we use today, which use an electromagnet rather than a traditional magnet. Faraday's discovery underpins most electricity generation today.
Generators are standalone machines that provide electricity when power from the local grid is unavailable. They can be used as a backup power source during power outages or as a primary power source in areas where the local electrical grid is unavailable or hard to access. Generators can be small, portable devices that provide power for a few devices, or permanent installations that power entire buildings or complexes.
Generators work by using an engine to supply energy, which is then converted from mechanical energy to electrical energy in the alternator or 'genhead'. The size of the engine determines the maximum power output. The alternator contains moving and stationary parts that work together to create an electromagnetic field and the movement of electrons that generates electricity. This electricity is then directed through copper wires to power external machines or devices.
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They don't create electricity
Generators do not create electricity, they convert mechanical or chemical energy into electrical energy. They do this by capturing the power of motion and turning it into electrical energy by forcing electrons from an external source through an electrical circuit.
Generators are useful appliances that supply electrical power during a power outage, preventing disruptions to daily life and business operations. They are available in different electrical and physical configurations for various applications.
Generators work on the principle of electromagnetic induction, discovered by Michael Faraday in 1831. Faraday found that moving a magnet inside a coil of wire induces an electric current to flow through the wire. This led to the design of the electromagnetic generators we use today.
Generators use an electromagnet, which is a magnet produced by electricity, rather than a traditional magnet. A basic electromagnetic generator has a series of insulated wire coils that form a stationary cylinder, called a stator, which surrounds an electromagnetic shaft, called a rotor. Turning the rotor makes an electric current flow in each section of the wire coil, and each section becomes a separate electric conductor. The currents in the individual sections combine to form one large current, which is the electricity that moves from generators through power lines to consumers.
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Michael Faraday's discovery
Michael Faraday, an English chemist and physicist, made groundbreaking discoveries in the fields of electricity and magnetism. Born in 1791, Faraday received little formal education but went on to become one of the most influential scientists in history.
Faraday's interest in science began when he attended lectures by Sir Humphry Davy at the Royal Institution of Great Britain in London. Impressed by Davy, Faraday sent him a bound copy of his notes along with a letter seeking employment. Although there were no openings initially, Davy later offered Faraday a job as his laboratory assistant, marking the beginning of Faraday's scientific career.
Faraday's major contributions include his work in electricity and magnetism. He was the first to produce an electric current from a magnetic field, inventing the first electric motor and dynamo. In 1820, Faraday produced the first known compounds of carbon and chlorine, and in 1825, he isolated and described benzene.
Faraday's breakthrough discovery came in 1831 when he found that moving a magnet inside a coil of wire induces an electric current to flow through the wire. This phenomenon, known as electromagnetic induction, forms the basis of modern electric generators. Faraday constructed the first electricity generator, called the Faraday disk, which operated on the relationship between magnetism and electricity.
Faraday's experiments established that a changing magnetic field produces an electric field. This relationship was mathematically modelled by James Clerk Maxwell as Faraday's law, which became one of the four Maxwell equations and evolved into modern field theory. Faraday's work laid the foundation for electric motor technology and the design of electromagnetic generators used today.
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Kinetic energy and motion
Generators are devices that convert mechanical energy from an external source into electrical energy as output. They do not create electrical energy but force the movement of electric charges in their windings through an external circuit. The kinetic energy of a moving object is equal to the work required to bring it from rest to that speed or the work the object can do while being brought to rest.
Kinetic energy is a form of energy that an object possesses due to its motion. It is related to the mass and speed of the object. The faster an object is moving, the more kinetic energy it possesses. Similarly, the greater the mass of an object, the more kinetic energy it has. For example, a car traveling twice as fast as another car requires four times as much distance to stop, assuming a constant braking force.
Kinetic energy can be passed from one object to another. In the game of billiards, the player passes kinetic energy to the cue ball by striking it with a cue stick. If the cue ball collides with another ball, it slows down, and the ball it hit accelerates as the kinetic energy is passed on.
Kinetic energy can also be stored in rotational motion. Flywheels, for instance, store energy as kinetic rotational energy. When energy is needed, the spinning force of the flywheel is used to turn a generator.
Electricity can be stored in several ways, including pumped hydroelectric storage, compressed air, and batteries. Storing electricity helps balance fluctuations in supply and demand, allowing electricity to be released back to the grid during periods of higher demand.
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Types of electricity storage
Storing electricity can provide economic, reliability, and environmental benefits. It can help balance fluctuations in electricity supply and demand, allowing electricity to be stored during periods of high production and low demand and then released during periods of lower production or higher demand.
Pumped Hydroelectric Storage
This is the most common form of electricity storage, accounting for 94% of the United States' electrical energy storage capacity as of March 2018. Electricity is used to pump water up to a reservoir. When water is released from the reservoir, it flows down through a turbine to generate electricity.
Compressed Air
Electricity is used to compress air and store it, often in underground caverns. When electricity demand is high, the pressurised air is released to generate electricity through an expansion turbine generator.
Flywheels
Electricity is used to accelerate a flywheel, which is a type of rotor, and the energy is conserved as kinetic rotational energy. When the energy is needed, the spinning force of the flywheel is used to turn a generator.
Batteries
Large-scale batteries, similar to rechargeable batteries, can store electricity until it is needed. These can use lithium-ion, lead-acid, lithium-iron, or other battery technologies.
Thermal Energy Storage
Electricity can be used to produce thermal energy, such as chilled water or ice, which can be stored and used for cooling during periods of peak electricity consumption. Electrical energy can also be stored thermally and converted back to electricity.
Other forms of electricity storage include steam accumulators, capacitors, and flow batteries.
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Frequently asked questions
Electricity storage is the process of storing electricity during periods of high production and low demand, and then releasing it back to the electric power grid during periods of lower production or higher demand.
Electricity can be stored in a variety of ways, including pumped hydroelectric storage, compressed air, flywheels, and batteries.
Pumped hydroelectric storage involves using electricity to pump water up to a reservoir. When the demand for electricity is high, the water is released from the reservoir and flows down through a turbine to generate electricity.
Generators convert mechanical or chemical energy into electrical energy. They capture the power of motion and turn it into electrical energy by forcing electrons from an external source through an electrical circuit.
