Electrical safety

Circuit Symbols

Symbols that represent circuit components in circuit diagrams.

Resistor

A component that controls current in a circuit.

Thermistor

A temperature-dependent resistor whose resistance changes with temperature.

Light-Dependent Resistor (LDR)

A resistor whose resistance decreases as light intensity increases.

Ammeter

A device that measures current and is connected in series.

Voltmeter

A device that measures potential difference and is connected in parallel.

Diode

A component that allows current to flow in one direction only.

Relay

A switch that uses a small current to control a larger current in another circuit.

Transformer

A device that 'steps up' or 'steps down' current and potential difference.

Fuse

A protective device that prevents current surges from damaging components.

Motor

A functional component that rotates when current passes through.

Heater

A functional component that transfers thermal energy.

Lamp

A device that emits light when current flows through.

Electromagnetic Components

Components such as magnetising coils that utilize electromagnetic effects.