# Symbols of Components

## Symbols of Components

• Each component in an electric circuit has a unique symbol for identification. These symbols are standard across international physics curriculums.

• A straight line represents a wire connecting other components or parts of a circuit.

• A cell, or battery, is symbolised by two lines. A longer line represents the positive terminal whilst the shorter line represents the negative terminal.

• More than one cell connected together is depicted as several juxtaposed pairs of short and long lines.

• A lamp (bulb) is displayed as a circle with an ‘X’ inside. This represents the filament within the bulb.

• For resistors, a zig-zag or rectangular box is used. Resistors are components that resist the flow of electric current and reduce voltage.

• A capacitor, which stores electric charge, is represented by two parallel lines with a gap between them. One line is often curved.

• A fuse, a device designed to break a circuit if the current flowing through it is too high, is symbolised by a rectangular shape with a line going through it.

• Switches are indicated by a break in the line. If the switch is closed, the break is paired with an adjacent line.

• Diodes, which permit current flow in one direction only, are shown as a triangle facing a line.

• The symbol for a voltmeter, a device that measures voltage, is a circle with a “V” in the middle.

• The symbol for an ammeter, which measures current, is a circle with an “A”.

Remember, whilst understanding these symbols is paramount, so too is understanding how these components function within a circuit. This will help you to efficiently design, analyse and predict outcomes in different electric circuit setups.