OFS Science: G7 Electricity
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Created by:
stephen_foster on April 8, 2012
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Description:
Grade 7 Electricity
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23 terms
Terms | Definitions |
|---|---|
 Ammeter | An instrument used to measure electrical current in a circuit |
| Ampere or Amps | The unit of current (A). |
| Charge | The amount of electricity in a circuit. |
| Circuit | A complete path around which an electric current can flow |
| Circuit diagram | A simplified way of drawing a circuit. Straight lines and symbols are used. |
| Conductor | A substance that allows an electric current to flow through it. eg. Metals and carbon (graphite). |
| Current | The flow of electrons around a circuit. |
| Earth | 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. |
| Electron | Tiny negatively charged particles found outside an atom. |
| Fuse | 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. |
| Insulator | A substance that does not allow an electric current to flow through it. eg. Rubber, wood etc. |
| Live | The brown wire in a plug. |
| Metal | Generally hard, shiny elements that are good conductors of electricity. They have 'free electrons' that give them this property. eg. Copper, iron etc. |
| Neutral | The blue wire in a plug. |
| Ohms | The unit of resistance. |
| Parallel circuit | An electric circuit with branches at junctions where the current can take different paths. Made of more than one loop. |
| Resistance | How much a substance resists the flow of current through it. |
| Series circuit | An electric circuit in which the parts are connected one after the other, without any branches. Made of only one loop. |
| Short circuit | A lower resistance path for the electrical current in a circuit; it is usually caused by a loose connection. |
| Symbol | An image used to represent an electrical part in a circuit diagram. |
| Terminals | Metal connection points on batteries, bulbs or other electrical equipment. |
| Volt | The unit of voltage (V). |
| Voltage | The electrical 'push' in a circuit. |
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