Key points about electricity
- Electricity is the presence or flow of There are two types of charged particles - positively charged particles (eg protons or positive ions) and negatively charged particles (eg electrons)..
- An electric current is the flow of These are one of the particles that atoms are made from. They聽have a negative charge.聽Charge can be positive or negative.聽For example,聽protons are positively charged and electrons are negatively charged.聽 around a An electrical circuit is made up of components, which are connected together using wires..
- Static electricity is the build up of electrons on an A material that does not allow current to flow through it easily, eg wood or glass. .
Did you know?
- Electricity travels at the speed of light - about 300,000 kilometres per second.
- Electricity was first discovered in 600BC - the Ancient Greeks discovered static electricity.
- Electric cars date back as far as 1832.
How does electricity power a car?
Video
A case study video explaining how electricity is used to power a car.
How is an electric car powered?
A battery-powered car, or Electric Vehicle, does not have a gasoline or diesel engine and instead has an electric motor, power electronics, and a battery pack. They are better for the environment in terms of the amount of emissions produced whie driving compared to petrol or diesel powered cars.
How is electricity used?
Everything is made up of tiny particles. These particles may have positive or negative charges. Electricity is the presence or flow of these charged particles.
All materials contain negatively-charged particles called electrons. In metals the electrons are free to move, which means they are good A material which allows electrical current to flow through it easily, eg copper or gold. of electricity. If there is a complete circuit a battery can push electrons all around the circuit. This is an electric current. We use electric currents to control and operate devices, including phones, computers and light bulbs.
Some materials do not conduct electricity 鈥 they are insulators. Most non-metal materials such as plastic, wood and rubber are insulators.
Imagine rubbing a balloon on your jumper. The balloon and jumper are each made of different insulating materials. As you rub, electrons move from the jumper to the balloon, so negative charge builds up on the balloon and causes A build-up of electrical charge on an object, which can be either positive or negative.. If you touch the balloon, you may feel an This occurs if current flows through a person鈥檚 body.聽Electric shocks can be painful.聽Large electric shocks聽(eg from lightning)聽can cause burns聽and could be fatal.聽as the charge travels through you to the ground.
Test your knowledge
Play the Atomic Labs game! game
Try out practical experiments in this KS3 science game.
More on Electricity
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