An instrument used to measure electrical current in a circuit
Ampere or Amps
The unit of current (A).
The amount of electricity in a circuit.
A complete path around which an electric current can flow
A simplified way of drawing a circuit. Straight lines and symbols are used.
A substance that allows an electric current to flow through it.
eg. Metals and carbon (graphite).
The flow of electrons around a circuit.
A connection between an electrical appliance and the ground. Used to discharge things or keep them safe if they are metal cased appliances. The yellow and green wire in a plug.
Tiny negatively charged particles found outside an atom.
A safety devicefound inside a plug. It stops the current by 'melting' when there is a fault in the circuit and protects your expensive equipment from sudden 'surges' of current.
A substance that does not allow an electric current to flow through it.
eg. Rubber, wood etc.
The brown wire in a plug.
Generally hard, shiny elements that are good conductors of electricity. They have 'free electrons' that give them this property. eg. Copper, iron etc.
The blue wire in a plug.
The unit of resistance.
An electric circuit with branches at junctions where the current can take different paths. Made of more than one loop.
How much a substance resists the flow of current through it.
An electric circuit in which the parts are connected one after the other, without any branches. Made of only one loop.
A lower resistance path for the electrical current in a circuit; it is usually caused by a loose connection.
An image used to represent an electrical part in a circuit diagram.
Metal connection points on batteries, bulbs or other electrical equipment.
The unit of voltage (V).
The electrical 'push' in a circuit.