ELECTRIC COMPONENTS

Circuit Symbols

C

ircuit symbols are used in circuit diagrams which show how a circuit is connected together.

Component	Circuit Symbol	Function of Component
Wire		To pass current very easily from one part of a circuit to another.

Cell		Supplies electrical energy. The larger terminal (on the left) is positive (+).
Battery		A battery is more than one cell.
Fuse		A safety device which will 'blow' (melt) if the current flowing through it exceeds a specified value.

Lamp		A transducer which converts electrical energy to light.
Motor		A transducer which converts electrical energy to kinetic energy (motion).
Bell		A transducer which converts electrical energy to sound.
Buzzer		A transducer which converts electrical energy to sound.

Push Switch		A push switch allows current to flow only when the button is pressed.
On-Off Switch		An on-off switch allows current to flow only when it is in the closed (on) position.
2-way Switch		. A 2-way changeover switch directs the flow of current to one of two routes according to its position.

Resistor

A resistor restricts the flow of current.

Voltmeter		A voltmeter is used to measure voltage.
Ammeter			An ammeter is used to measure current.
Ohmmeter		An ohmmeter is used to measure resistance.

COMPLETE THE CHART http://www.kpsec.freeuk.com/