# OFS Science: G7 Electricity

## 23 terms · Grade 7 Electricity

### 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.