• Amp
    The Amp is a measure of electric current.
  • Battery
    A battery is two or more electric cells joined together which produce an electric potential difference. We usually call this voltage.
  • Circuit
    A collection of wires and electric components connected together in such a way that electric current can flow through them.
  • Conductor
    A material that carries electric current really well.
  • Electric current
    Electric current is a flow of electric charges (electrons).
  • Electricity flex
    Electric wire covered in an insulating material like plastic.
  • Electromagnet
    A magnetic field is produced when an electric current is passed through a wire wrapped around a piece of iron. The iron has become an electromagnet.
  • Electromagnetic induction
    When a wire passes close to a magnet (through a magnetic field), an electric current is generated in the wire.
  • Fossil fuel
    Coal, oil and gas are called fossil fuels because they were formed from the remains of prehistoric plants and animals.
  • Fuse
    Fuses are safety devices, which protect electrical appliances by preventing too much electric current flowing through them. The fuse is a thin wire inside a protective case. If too much electric current flows through the wire, it melts and stops the current flowing.
  • Generator
    A machine that causes an electric current to flow in wires by taking energy as movement and transferring it to energy as moving charge.
  • Insulator
    A material that reduces or stops the flow of electric current.
  • Mains electricity
    Electric current supplied to our homes from the national grid.
  • National grid
    A network of electricity supply lines that carry electric current from where it is generated in power stations to the place where it is used - our homes, factories, shops and railways.
  • Nuclear reaction
    A nuclear reaction can happen when very small particles of certain types of matter split apart. The reaction releases a lot of heat and other products.
  • Overhead line
    Thick electric cables that carry electricity from where it is generated to where it is used.
  • Power station
    Power stations generate electric current in very large quantities for supply to the national grid.
  • Pylon
    A tall metal tower that carries very high voltage power lines.
  • Renewable energy
    Energy that comes from sources that don't run out or get used up. There are a few types: solar energy, wind energy, tidal (energy from waves) and hydroelectricity.
  • Static electricity
    What we commonly call 'static electricity' is a build up of electric charge that can't go anywhere, as it is not connected to an electric circuit or some other means where it can flow to form an electric current. Static electricity is the build up of the charge that can cause high voltages to be created.
  • Substation
    Substations are an important part of the national grid. They contain transformers which increase or decrease the voltage of an electric current. Substations are very dangerous if you try to tamper with them or vandalise them. Do not enter a substation for any reason - it is against the law and you could be electrocuted.
  • Terminal
    Batteries have two terminals - a positive terminal shown by a + and a negative terminal shown by a -. When you make a circuit, make sure you connect the wires to the + and - terminals correctly.
  • Transformer
    A transformer is a device that can change the voltage associated with an electric current. One type of transformer decreases the voltage and so is called a 'step-down' transformer. A 'step up' transformer increases the voltage.
  • Voltage
    A measure the energy of the electric charges in a circuit.


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