ip2.18.3 circuit symbols © oxford university press 2011 circuit symbols
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IP2.18.3 Circuit symbols
© Oxford University Press 2011
Circuit symbols
IP2.18.3 Circuit symbols
© Oxford University Press 2011
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
© Oxford University Press 2011
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
© Oxford University Press 2011
Cell
Supplies electrical energy. Larger terminal is positive. Normally 1.5 V.
IP2.18.3 Circuit symbols
© Oxford University Press 2011
Battery
Supplies electrical energy.
Made up of multiple cells
IP2.18.3 Circuit symbols
© Oxford University Press 2011
Diode
A component that only allows current to flow in one direction.
IP2.18.3 Circuit symbols
© Oxford University Press 2011
Resistor
Restricts the flow of current in a circuit.
IP2.18.3 Circuit symbols
© Oxford University Press 2011
Variable resistor
A component used to vary and control the current in a circuit.
IP2.18.3 Circuit symbols
© Oxford University Press 2011
Lamp
A component that transforms electrical energy into light.
IP2.18.3 Circuit symbols
© Oxford University Press 2011
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
© Oxford University Press 2011
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
© Oxford University Press 2011
Thermistor
A component whose resistance is related to temperature
IP2.18.3 Circuit symbols
© Oxford University Press 2011
Light-dependent resistor (LDR)
A component whose resistance is related to the amount of light falling on it.
IP2.18.3 Circuit symbols
© Oxford University Press 2011
Light-emitting diode (LED)
A component that transforms electrical energy into light.
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