Electric Power Sources
Electric Power Sources
An electric power source is anything that provides electrical energy to a circuit or system. So where does it come from?
Electron flow
Electrons are negatively charged particles within atoms. They sit around the outside of the atom’s nucleus and, depending on the atom, can move from one atom to another.
When electrons flow from one atom to another, we call that movement current - that is the flow of electricity.
Conductors
Conductors are materials made up of atoms whose outer electrons are easy to move, so electricity can flow through the material. These materials include metal and water. Copper is one of the most common conductors used in electronics.
Insulators
Insulators are materials that do no allow electrons to flow between them, and therefore prevent the flow of electricity. Plastic, Rubber and glass are common insulators.
Types of Electricty
Nikola Tesla and Thomas Edison were both influential figures in the early development of electrical systems, but they supported different approaches. Nikola Tesla promoted alternating current (AC), which could be transmitted efficiently over long distances and is still used in modern power grids today. Thomas Edison supported direct current (DC) and focused on practical inventions like the light bulb and early power stations. Their rivalry, often called the War of the Currents, helped shape how electricity is generated and distributed around the world.
Alternating Current (AC)
AC is a type of electrical current where the direction of electron flow constantly reverses. This back-and-forth movement allows electrical energy to be transmitted efficiently over long distances, which is why AC is used in power stations, and provides power to our homes and businesses. A key advantage of AC is that its voltage can be easily increased or decreased using transformers, making it practical for safely delivering electricity from generators to homes as well as industrial factories.
https://www.youtube.com/watch?v=WhATjUHgzxQ
Direct Currect (DC)
Direct current (DC) is a type of electrical current where electrons flow in one direction only. This steady flow makes DC ideal for low-voltage and electronic systems that require stable and predictable power. DC is produced by sources such as batteries, solar panels, and power supplies, and it is commonly used in devices like phones, computers, and small electronics.
https://www.youtube.com/watch?v=ATFqX2Cl3-w
Power Sources
As with all energy, we cannot create it, we can only transfrom one form to another. There is currently global debate around power sources between renewable energy sources, fossil fuels and the impacts on climate change.
Power Stations
Power Stations are large-scale generators that generate massive amounts of electricity. Most power stations operate essentially in the same way, harnessing energy from something into rotational movement, which in turn drives a generator to produce electricity through electromagnetic induction.
Coal
In a coal-fired power station, large amounts of coal are burned to generate heat, which is used to boil water to produce steam. That steam spins turbines to drive the generator.
Wind
Wind farms harness the kinetic energy of moving air to spin turbine blades.
Hydro
Hydroelectric power stations use the gravitational force of falling or flowing water to turn turbines.
Nuclear
A nuclear power station uses energy released from nuclear fission, where atoms (usually uranium) are split inside a reactor. This process releases a large amount of heat, which is used to boil water and produce steam to turn turbines.
Solar
Large-scale solar power stations are the exception to generating rotational movement, using photovoltaic cells (PV) to generate DC electricity, which is converted to AC through inverters.