Trystan Casey
Electricity is not freely available in nature, so it must be produced by transforming other forms of energy. This process of electricity generation involves using generators powered by different sources, from coal and natural gas to wind, solar, and nuclear energy. The generated electricity is then transmitted through power lines to consumers, stepping down the voltage to safer levels for home use. The fundamental principles of electricity generation were discovered by Michael Faraday in the 1820s and 1830s, and his method of using electromagnetic induction is still prevalent today.
| Characteristics | Values |
|---|---|
| How electricity is generated | By moving a magnet inside a coil of wire, which makes an electric current flow through the wire |
| Where electricity is generated | Power stations or power plants |
| What electricity is generated from | Heat engines fuelled by combustion or nuclear fission, or other means such as kinetic energy of flowing water, wind, solar photovoltaics, and geothermal power |
| How electricity is transported | Via power line grids at higher voltages; by the time it reaches homes, electricity is transformed down to safer 100-250 voltage systems |
| How electricity travels through a home | Through wires inside the walls to the outlets and switches |
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What You'll Learn
- Electricity generation sources: coal, oil, natural gas, wind, solar, nuclear
- Power plants: how electricity is made in power plants
- Power transmission: how electricity is transmitted from power plants
- Faraday's law: the movement of a wire loop between magnet poles
- Electrical circuits: how electricity flows through circuits
Electricity generation sources: coal, oil, natural gas, wind, solar, nuclear
Coal
Coal is a fossil fuel that has been used to generate electricity since the Industrial Revolution. Coal is burned to heat water, creating steam. The steam then spins a turbine to produce electricity. Coal generation has been in decline due to the dash for gas and the decarbonisation of the grid.
Oil
Oil is a fossil fuel that, like coal and gas, can be used to generate electricity through heat. The heat generated by oil can be used to create steam, which spins a turbine to produce electricity.
Natural Gas
Natural gas is collected from under the Earth's surface and transported through pipelines to power plants. At the power plants, the gas is used to create steam that spins a turbine and generates electricity. Alternatively, pressurised gas can turn the blades of a turbine connected to a generator.
Wind
Wind turbines use blades to collect the wind's kinetic energy. As wind flows over the blades, it creates lift, causing the blades to turn. The blades are connected to a drive shaft that turns an electric generator, which produces electricity. Wind electricity generation has grown significantly in recent years due to advances in technology and government incentives for renewable energy.
Solar
Solar panels are made from semiconductors such as monocrystalline silicon, polycrystalline silicon, or thin-film solar cells. When sunlight hits the thin layer of semiconductive material, it triggers the release of electrons, creating an electric current that is harnessed by wiring connected to the solar panels to produce electricity. Solar power systems are carbon-free and can help reduce electricity costs by lowering consumption from the grid.
Nuclear
Nuclear energy is produced through nuclear fission, where the nucleus of an atom splits into smaller nuclei while releasing energy. Uranium-235 is commonly used to fuel nuclear reactors and produce heat through fission. The heat warms the reactor's cooling agent, typically water, to produce steam that spins turbines and activates an electric generator to create electricity. Nuclear power is a low-carbon source of energy as it does not produce CO2 during its operation.
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Power plants: how electricity is made in power plants
Power plants, also called power stations, are where electricity is most often generated. The process of electricity generation varies depending on the energy source.
Fossil Fuels
Fossil fuel-fired power plants burn fuels such as coal, natural gas, biomass-based liquid fuels, biogas, or propane to generate electricity. Coal-generated electricity, for example, is created by milling coal into a fine powder that is blown into a combustion chamber of a boiler and burned at a high temperature. The heat produced is used to create steam, which moves the blades of a turbine. The turbine then drives an electric generator, converting mechanical energy to electrical energy.
Nuclear Power
Nuclear power plants use nuclear reactions to produce steam, which is then used to generate electricity. Some nuclear power plants use uranium atoms, which are split when hit by a neutron, releasing heat and radiation and creating more neutrons. This process repeats itself in a chain reaction that is controlled to produce heat. The heat is then combined with water to produce steam, which drives a turbine connected to an electric generator.
Renewable Energy Sources
Renewable energy sources such as wind, hydropower, solar power, biomass, and geothermal power are also used to generate electricity. Wind turbines, for instance, use wind power to move the blades of a rotor, which powers an electric generator. Solar energy uses solar panels or photovoltaic cells to absorb light energy from the sun, charging electrons and allowing them to flow through the cell to generate electricity. Hydroelectric power plants use water stored in a reservoir or diverted from a river or stream to power turbines, which then drive electric generators.
Electricity Transmission
Once electricity is generated, it is transmitted through a transmission grid of high-voltage transmission lines. The voltage is initially low when the electricity leaves the generating facility, but it is then ""stepped up"" by a transformer to minimise power losses over long distances. When the electricity arrives in load areas, the voltage is ""stepped down"" by substation transformers and lowered again before it reaches consumers.
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Power transmission: how electricity is transmitted from power plants
Power transmission is the bulk movement of electricity from a generating site, such as a power plant, to an electrical substation. The electricity generated is transported at higher voltages via power line grids. The interconnected lines that enable the movement of electrical energy are known as a transmission network, forming an electrical power transmission system or the power grid.
Electricity is usually generated at a power plant by electromechanical generators, driven by heat engines fuelled by combustion or nuclear fission. Other methods include using the kinetic energy of flowing water and wind, solar photovoltaics, and geothermal power.
The voltage level is then changed with transformers. The voltage is stepped up for transmission to reduce losses produced by strong currents, and then reduced for local distribution. This is known as primary transmission. The electrical power is transmitted via overhead electrical lines, although some countries use underground cables for shorter distances.
Once the electricity reaches a substation, it is stepped down once more by a step-down transformer to voltages closer to what it was generated at. From here, the transmission phase graduates to the distribution phase, and the electricity is distributed to meet demand from primary and secondary consumers.
Long-distance power transmission became possible in the 1880s, with the development of alternating current (AC) power transmission. The first long-distance AC line was 34 kilometres long, built for the 1884 International Exhibition of Electricity in Turin, Italy.
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Faraday's law: the movement of a wire loop between magnet poles
The fundamental principles of electricity generation were discovered in the 1820s and early 1830s by British scientist Michael Faraday. Faraday's law of electromagnetic induction, or simply Faraday's law, states that a changing magnetic field generates an electric current in a conductor. This law describes how an electric current produces a magnetic field and, conversely, how a changing magnetic field can induce an electric current.
Faraday's law can be experimentally demonstrated by moving a wire loop or coil between the poles of a magnet. When a magnet is moved in and out of a coil or a single loop of wire, it induces an ElectroMotive Force (EMF) or voltage, which in turn produces an electric current. This phenomenon is known as electromagnetic induction.
The rotational movement of the magnetic field results in an alternating EMF being induced into the coil. The magnitude of the electromagnetic induction is directly proportional to the flux density, the number of loops, and the rate or velocity at which the magnetic field changes. Faraday's law tells us that to induce a current, there must be "relative motion" or movement between the coil and the magnetic field. This means that either the magnetic field, the coil, or both can be moved.
Faraday's discovery led to the design of the electromagnetic generators we use today. Electric generators transform kinetic energy into electricity and are the most common method for generating electricity based on Faraday's law.
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Electrical circuits: how electricity flows through circuits
Electricity is generated in power plants, which use a variety of energy sources to produce electricity. These include coal, nuclear energy, wind, solar, and hydroelectric power. The fundamental principles of electricity generation were discovered by Michael Faraday in the 1820s and 1830s. Faraday's method, still used today, involves the movement of a wire loop between a magnet's poles, inducing an electric current. This principle forms the basis of electromagnetic generators, which use electromagnets surrounded by wire coils to generate electricity.
Electricity flows through closed circuits, which provide a complete path for electrons to move. Electrons move from areas of negative charge to positive charge, creating an electric current. Conductive materials, such as metals, allow electrons to move freely between atoms. Applying voltage across a conductor creates an electric field, which exerts a force on the electrons, propelling them through the conductor. This flow of electrons is what we refer to as electricity.
A simple example of a closed circuit is a light bulb connected to a battery with a switch and wire. When the switch is closed, the circuit is complete, and the battery's negative terminal repels electrons, sending them through the wire to the bulb. As a result, the bulb lights up, and the electrons return to the positive terminal. Opening the switch breaks the circuit, stopping the flow of electricity.
There are two main types of electrical circuits: series and parallel circuits. In a series circuit, components are arranged end-to-end, allowing the same current to flow through each component. If one component fails, the circuit breaks, and the current stops flowing. In contrast, parallel circuits have multiple paths for the current, with components arranged side by side.
Understanding electrical circuits and symbols is crucial for comprehending electronics. Symbols represent various components, such as capacitors, batteries, and light bulbs, and learning them is essential for creating and interpreting complex circuit diagrams.
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Frequently asked questions
Electricity is most often generated at a power plant by electromechanical generators, driven by heat engines fuelled by combustion or nuclear fission. Other methods include solar photovoltaics, wind turbines, hydropower, and geothermal power.
Generators transform kinetic energy into electricity. This is achieved by rotating a magnet within closed loops of conducting material, such as copper wire. This creates an electric current.
The electricity generated is transported at high voltages via power line grids. Transformers are used to increase the voltage to push power over long distances. The voltage is then lowered by substations so that it can be sent on smaller power lines to neighbourhoods. Smaller transformers reduce the voltage again to make the power safe for use in homes.
The fundamental principles of electricity generation were discovered in the 1820s and 1830s by British scientist Michael Faraday. Commercial electricity production started with the coupling of the dynamo to the hydraulic turbine, leading to the Second Industrial Revolution. The popularity of electricity grew massively in the 1880s with the introduction of the incandescent lightbulb.
