ip2.18.3 circuit symbols © oxford university press 2011 circuit symbols

IP2.18.3 Circuit symbols © Oxford University Press 2011 Circuit symbols

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IP2.18.3 Circuit symbols

Circuit symbols

IP2.18.3 Circuit symbols

Circuit symbols are used to show the different components in a circuit.

The main reasons scientists use circuit symbols are: They are much simpler to draw than trying to reproduce an

accurate sketch of each component. Each different type of component has its own distinct

symbol which is easy to recognise. This means that the correct components can be identified easily.

The symbols are an almost universal language so it doesn’t matter what language you speak – the symbols are the same.

IP2.18.3 Circuit symbols

open switch

closed switch

An on-off switch allows current to flow only when it is in the closed (on) position

IP2.18.3 Circuit symbols

Cell

Supplies electrical energy. Larger terminal is positive. Normally 1.5 V.

IP2.18.3 Circuit symbols

Battery

Supplies electrical energy.

Made up of multiple cells

IP2.18.3 Circuit symbols

Diode

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

IP2.18.3 Circuit symbols

Resistor

Restricts the flow of current in a circuit.

IP2.18.3 Circuit symbols

Variable resistor

A component used to vary and control the current in a circuit.

IP2.18.3 Circuit symbols

Lamp

A component that transforms electrical energy into light.

IP2.18.3 Circuit symbols

Fuse

A safety device that will break the circuit and stop current flowing if the current flowing through it exceeds a specified value.

IP2.18.3 Circuit symbols

Voltmeter

Ammeter

Used to measure potential difference (voltage) between two points in a circuit.

Used to measure current in a circuit.

IP2.18.3 Circuit symbols

Thermistor

A component whose resistance is related to temperature

IP2.18.3 Circuit symbols

Light-dependent resistor (LDR)

A component whose resistance is related to the amount of light falling on it.

IP2.18.3 Circuit symbols

Light-emitting diode (LED)

A component that transforms electrical energy into light.

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