Trystan Casey
There are several different sources of electricity, which can be categorized into two primary forms: kinetic and potential energy. These include natural gas, coal, petroleum, nuclear power, hydropower, wind, biomass, and solar. Electricity can also be produced by electromechanical generators, primarily driven by heat engines fueled by combustion or nuclear fission, or by other means such as the kinetic energy of flowing water and wind. The process of electricity generation involves transforming other forms of energy into electrical energy, which can be understood through the movement of electrons between atoms.
| Characteristics | Values |
|---|---|
| Definition | The flow of charge |
| Basic building block | Atoms |
| Charge carriers | Protons and electrons |
| Voltage | Difference in potential between two points in an electric field |
| Electric potential energy | Depends on the type (positive or negative), amount of charge, and its position in the field |
| Measured in | Joules (J) |
| Electric potential | Amount of electric potential energy divided by the amount of charge at that point |
| Measured in | Joules per coulomb (J/C) or volts (V) |
| Sources | Fossil fuels, nuclear power, hydropower, wind, biomass, solar, natural gas, coal, petroleum |
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What You'll Learn
Electricity from fossil fuels
Fossil fuels have been a common source of energy for electricity generation for many decades, powering the Industrial Revolution and improving the quality of life worldwide. While burning fossil fuels has led to progress, it also contributes to climate change by releasing carbon dioxide and other greenhouse gases into the air. Electricity generation accounts for about 25% of global emissions, with coal being the most widely used fossil fuel for electricity generation.
In 2016, Canada derived 9.3% of its electricity from coal, 9.6% from natural gas, and 0.5% from oil and diesel. Certain provinces, such as Alberta, Saskatchewan, Nova Scotia, and Nunavut, rely heavily on fossil fuels for electricity production. In 2003, 25% of Ontario's electricity came from burning coal, but the last coal-fired power plant in the province closed in 2014.
The use of fossil fuels for electricity generation has been a challenging habit to break. Fossil fuels play a significant role in energy production in many developing countries, and the transition away from them must be balanced with the need for increased energy production to reduce poverty. Additionally, the economics of fossil fuel-based electricity generation can be compelling, with high target efficiencies and low projected capital and operational costs.
However, burning fossil fuels, especially coal and oil, releases various pollutants, including nitrogen oxides, sulfur dioxide, carbon monoxide, volatile compounds, and toxic trace metals. These emissions can lead to environmental issues such as acid rain, which harms soils, forests, lakes, and rivers. As a result, there is a growing focus on capturing carbon dioxide and other impurities during the fossil fuel electricity generation process to reduce greenhouse gas emissions.
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Electricity from nuclear power
Nuclear power is an important source of electricity and is expected to play a key role in the global transition to net-zero. Nuclear power stations work in a similar way to coal and gas-fired power stations, but instead of burning fossil fuels, they convert nuclear energy to heat energy. This heat energy is then converted to kinetic energy to produce electricity.
Nuclear power stations use nuclear reactors to initiate a process called nuclear fission. Nuclear fission is where a particle is fired at an atom, causing it to split into two smaller atoms and some additional neutrons. These neutrons then hit other atoms, causing them to also split and release more neutrons, creating a chain reaction. This process releases a lot of heat energy. Uranium and plutonium are the main nuclear fuels used in nuclear reactors, with enriched uranium being the most common fuel.
The heat generated by the nuclear reactor is removed by a circulating fluid, typically water. This water is heated and turned into steam, which drives a turbine to produce electricity. This process is the same basic principle used in coal and gas power plants. Nuclear power plants can run 24 hours a day without requiring additional fuel, making them a reliable source of electricity.
Nuclear power has several advantages over fossil fuels. Firstly, nuclear fuels produce no carbon dioxide or sulphur dioxide emissions, making them a zero-carbon source of energy. Secondly, nuclear fuels produce a significantly greater amount of energy per kilogram than coal. However, one of the main concerns with nuclear power is the risk of accidents, which could result in the release of large amounts of radioactive material into the environment.
Nuclear power is an important part of the energy mix in several countries. As of 2022, the United States had 55 commercially operating nuclear power plants, providing one-fifth of the country's electricity. In 2020, nuclear power accounted for 14.2% of electricity generation in Great Britain, second only to gas and wind.
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Electricity from wind and solar
Wind and solar power are crucial components of the energy mix required to achieve zero-carbon electricity systems. Wind power, generated by wind turbines, is a clean, free, and reliable source of energy. When the wind blows, the blades of wind turbines spin, capturing energy that is then converted into electricity through a gearbox and a generator. In 2020, around 25% of Britain's electricity was generated by wind power, and global wind power capacity exceeded 800 GW in 2021.
Solar power, on the other hand, uses photovoltaic solar cells to convert sunlight into electricity. When sunlight hits a photovoltaic cell, it creates an unbalanced charge, resulting in an electric current. This electricity can be sent directly to power homes or businesses, or it can be fed into the grid. In the United States, photovoltaic solar systems account for 97% of the country's solar capacity.
The combination of wind and solar power is particularly effective, as their seasonal variations tend to cancel each other out. For example, high-pressure areas with clear skies and low winds are ideal for solar power, while low-pressure areas with cloud cover and higher winds favour wind power. Additionally, wind and solar power have become increasingly cost-competitive, with utility-scale installations in some U.S. states being cheaper than coal when considering the levelized cost of energy.
To meet climate goals, such as the Paris Agreement, the expansion of wind and solar power needs to accelerate. This includes addressing challenges such as the development of new transmission lines to carry power from remote wind farms to high-load locations. Nevertheless, wind and solar power are essential components in the transition to a cleaner and more sustainable energy future.
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Static electricity
One common example of static electricity is the sensation of a small electric shock when touching a metal surface after walking on a rug or rubbing a balloon on hair. This occurs because the rug and the human body are made of different materials. When they come into contact, electrons may be transferred from the atoms in the person's body to the carpet fibres, leaving a positive charge on the carpet and isolating electrons in the person's body. When the person then touches a conductive material, such as a doorknob, the built-up charge is discharged, and electrons jump to the conductive material. This sudden movement of electrons can also cause the person's hair to stand on end due to the repulsive force between like charges.
Another example of static electricity is the phenomenon of static cling. When a balloon is rubbed against hair, the balloon becomes negatively charged as it gains electrons, while the hair becomes positively charged as it loses electrons. The charged balloon can then cling to a wall or other surface, as it is attracted to the positively charged particles in the wall. This attraction between opposite charges can suspend the balloon against gravity.
To minimize the accumulation of static electricity, various methods can be employed, such as touching metal surfaces, wearing appropriate clothing made of natural fibres, using antistatic products, keeping skin hydrated, and walking barefoot on natural surfaces. These practices help reduce friction and facilitate the discharge of static electricity.
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Lightning
Additionally, lightning can exhibit unique characteristics and behaviours. For example, "heat lightning" refers to lightning that is too far away for thunder to be heard, and it may appear reddish due to the scattering of blue light. "Spider lightning" describes long, horizontally travelling flashes often seen on the underside of stratiform clouds. Lightning can also trigger upward from the ground, typically from tall structures or during specific weather conditions, and it can strike the same spot multiple times, contrary to popular belief.
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Frequently asked questions
There are no different types of electricity per se, but there are different sources of electricity, such as fossil fuels, nuclear power, wind, solar, geothermal, hydro, and biopower.
Fossil fuels are natural gas, coal, and petroleum. They are burned to create energy, which is then used to power turbines and generate electricity.
Nuclear power uses nuclear fission to produce steam, which is then used to power turbines and generate electricity.
Hydropower uses the kinetic energy of flowing water to power turbines and generate electricity.
Solar power captures energy from the sun through photovoltaic solar cells, which heat fluids to produce steam and drive turbines.
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