Beatrice Lang
Electricity is a type of energy that comes from the flow of electrical power, also known as a charge. It is used to power our homes, lights, electronics, and even cars! Electricity is a secondary source of energy, which means it is made from other items found in nature, such as coal, oil, natural gas, and renewable sources like wind, water, and solar power. These sources are called primary sources and can be either renewable or non-renewable. Power plants use these primary sources to generate electricity, which is then transmitted through power lines to our homes and schools.
| Characteristics | Values |
|---|---|
| Electricity Sources | Coal, oil, natural gas, nuclear power, hydropower, solar, wind, biomass, petroleum |
| Electricity Generation Methods | Fossil fuels, nuclear reactors, hydropower, solar photovoltaic, solar thermal, batteries, fuel cells |
| Environmental Impact | Fossil fuels cause air pollution and contribute to premature deaths; nuclear power is environmentally-friendly and produces little waste |
| Recent Trends | Shift away from coal towards gas and renewable sources; solar, wind, and other renewable technologies are growing |
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What You'll Learn
Solar power
The sun is a very powerful source of energy. In 2022, solar electricity generation in the United States accounted for about 97% of total solar energy use. And in 2021, the world's solar electricity generation was about 1.3 trillion kilowatt-hours (kWh). Solar power is becoming more and more popular because it is a clean and renewable energy source.
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Hydroelectric power
People have used water power for a very long time. Waterwheels were probably invented in the 1st century BCE. The Ancient Romans used them to grind grain, and the Ancient Egyptians used them for grinding grain too. Early Americans used waterwheels for sawing wood.
Water can be a powerful force in nature. Its power can be seen in floods that uproot trees or heard in the roar of a waterfall. This power is called water power or hydropower.
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Nuclear power
The first time electricity was made using nuclear power was in 1951, in a place called Arco, Idaho. The first nuclear power plant, which is a special building for making electricity with nuclear power, was built in the 1950s. Since then, many countries have started using nuclear power to create electricity, and it's becoming more popular because it's a safe and sustainable way to generate electricity without making the planet warmer.
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Fossil fuels
People have been using fossil fuels a lot since the late 1700s. They are called "non-renewable" because they will run out one day and we can't make more. They are also bad for the environment. When fossil fuels are burned, they release gases that can be harmful. These gases can cause something called the "'greenhouse effect', which makes the Earth warmer and might be bad for living things. This is why some people want to use renewable energy instead, like solar and wind power.
Even though fossil fuels are bad for the environment, they are still very important for the world's economy. Many countries use them a lot, and it will be hard to stop. Scientists and engineers are working on ways to make power without using fossil fuels, like using nuclear energy, water power, or wind power to create electricity.
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Wind power
Wind turbines use blades to collect the wind's kinetic energy. The wind flows over the blades, creating lift, which causes the blades to turn. These blades are connected to a drive shaft that turns an electric generator, which produces the electricity. The longer the blades of a wind turbine, the more electricity it can generate.
There are two main types of wind power: onshore and offshore. Onshore wind power is generated by wind turbines located on land and driven by the natural movement of air. Offshore wind power is obtained by taking advantage of the wind that blows on the high seas. Offshore wind turbines are usually placed on bodies of water in remote locations far away from the mainland.
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Frequently asked questions
Electricity is a type of energy that comes from the flow of electrical power, also known as a charge. We use electricity every day to power our homes, lights, electronics, and even cars!
Electricity comes from renewable and non-renewable sources. Renewable energy sources include wind, solar, hydropower, and bioenergy. Non-renewable energy sources include coal, fossil fuels, and nuclear power.
Wind turbines convert wind energy into electricity. Hydropower plants use flowing water to spin a turbine connected to a generator. Solar energy uses photovoltaic cells to produce electricity directly from sunlight.
Fossil fuels such as coal, oil, and natural gas are burned to produce electricity. Nuclear power plants use nuclear fission, or the splitting of atoms, to generate electricity.
