Wire

Wires joined

Wires not joined

Cell

Battery

DC supp

ly

AC supp

ly

Fuse

Transformer

Earth

(Ground)

Lamp (lightin

g)

Lamp (indicat

or)

Heater

Motor

Bell

Buzzer

Inductor

(Coil, Soleno

id)

Push

Switch

(push-to-make)

Push-to-Brea

k Switch

On-Off

Switch

(SPST)

2-way Switch

(SPDT)

Dual On-Off

Switch

(DPST)

Reversing

Switch

(DPDT)

Relay

Resistor

Variable Resis

tor(Rheos

tat)

Variable Resis

tor(Potentiometer

)

Variable Resis

tor(Preset

)

Capacitor

Capacitor,

polarized

Variable Capa

citor

Trimmer

Capacitor

Diode

LEDLight Emitting Diode

Zener Diode

Photodiode

Transistor N

PN

Transistor P

NP

Phototransis

tor

Microphone

Earphone

Loudspeaker

Piezo Transdu

cer

Amplifier

(general sym

bol)

Aerial(Anten

na)

Voltmeter

Amp-meter

Galvanome

ter

Ohmmeter

Oscilloscop

e

LDR

Thermistor