Circuit Symbols 2

*04 Electronics (160-187).qxd

2/2/07

12:15 pm

Page 161

Circuit symbols 2 Key words Heater

Galvanometer

Fixed resistor

Microphone

amplifier capacitor cell electrolytic capacitor

galvanometer light-dependent resistor (LDR)

Components–symbols and function in circuits ● Electronic

+

Potential divider

Earphone

Capacitor

Loudspeaker

(Polarized) electrolytic capacitor

Electric bell

Inductor

symbols are used in electric circuits in order to represent components. The use of these symbols is universal so a circuit can be read and understood by physicists who speak different languages.

cell

M

lamp

Motor

M switch Amplifier

Transformer with ferromagnetic core

Light dependent resistor (LDR)

A

Ammeter

Photo-voltaic cell

V

Voltmeter

motor

two cells

microphone/tape recorder

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Inductor with ferromagnetic core