CatalogueRequest CatalogueRequest

Lines Open: Mon - Fri 8:30am - 5:30pm. Sat 8:30am - 1:00pm

0800 197 65 65

0330 555 65 75

Free from UK landlines

Int'l & Mobile Friendly

Electrical & Electronic Symbols

Electrical & Electronic Symbols


 

Symbol

Component name

Meaning

Wire Symbols
 1

Electrical Wire

Conductor of electrical current

 2

Connected Wires

Connected crossing

 3

Non Connected Wires

Wires that cross & are not connected

Switch Symbols and Relay Symbols
 4

SPST Switch

Disconnects current when open

 5

SPDT Switch

Selects between two connections

 6

Pushbutton Switch (N.O)

Momentary switch - Normally Open

 7

Pushbutton Switch (N.C)

Momentary switch - Normally Closed

 8

DIP Switch

DIP switch is used for on-board configuration

 9

SPST Relay

Relay open / close connection by an electromagnet

 10

SPDT Relay

 11

Jumper

Close connection by jumper insertion on pins.

 12

Solder Bridge

Solder to close connection

Ground Symbols
 13

Earth Ground

Used for zero potential reference and electrical shock protection.

 14

Chassis Ground

Ground connected to the chassis.

Resistor Symbols
 15

Resistor (IEEE)

Resistor reduces the current flow.

 16

Resistor (IEC)

 17

Potentiometer (IEEE)

Adjustable resistor - has 3 terminals.

 18

Potentiometer (IEC)

 19

Variable Resistor / Rheostat (IEEE)

Adjustable resistor - has 2 terminals.

 20

Variable Resistor / Rheostat (IEC)

 21

Trimmer Resistor

Pre-set resistor

 22

Thermistor

Thermal resistor - change resistance when temperature changes

 23

Photo Resistor / Light dependent resistor (LDR)

Photo Resistor - change resistance with light intensity change

Capacitor Symbols
 24

Capacitor

Capacitor is used to store electric charge. It acts as short circuit with AC and open circuit with DC.

 25

Capacitor

 26

Polarized Capacitor

Electrolytic capacitor

 27

Polarized Capacitor

Electrolytic capacitor

 28

Variable Capacitor

Adjustable capacitance

Inductor / Coil Symbols
 29

Inductor

Coil / solenoid that generates magnetic field

 30

Iron Core Inductor

Includes iron

 31

Variable Inductor

 Moving the core farther into the coil increases the permeability, increasing the magnetic field and the inductance.

Power Supply Symbols
 32

Voltage Source

Generates constant voltage

 33

Current Source

Generates constant current.

 34

AC Voltage Source

AC voltage source

35 

Generator

Electrical voltage is generated by mechanical rotation of the generator

 36

Battery Cell

Generates constant voltage

 37

Battery

Generates constant voltage

 38

Controlled Voltage Source

Generates voltage as a function of voltage or current of other circuit element.

 39

Controlled Current Source

Generates current as a function of voltage or current of other circuit element.

Meter Symbols
 40

Voltmeter

Measures voltage. Has very high resistance. Connected in parallel.

 41

Ammeter

Measures electric current. Has near zero resistance. Connected serially.

 42

Ohmmeter

Measures resistance

 43

Wattmeter

Measures electric power

Lamp / Light Bulb Symbols
 44

Lamp / light bulb

Generates light when current flows through

 45

Lamp / light bulb

 46

Lamp / light bulb

Diode / LED Symbols
 47

Diode

Diode allows current flow in one direction only (left to right).

 48

Zener Diode

Allows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage

 49

Schottky Diode

Schottky diode is a diode with low voltage drop

 50

Varactor / Varicap Diode

Variable capacitance diode

 51

Tunnel Diode

 A type of semiconductor that is capable of very fast operation, well into the microwave frequency region, made possible by the use of the quantum mechanical effect called tunnelling.

 52

Light Emitting Diode (LED)

LED emits light when current flows through

 53

Photodiode

Photodiode allows current flow when exposed to light

Transistor Symbols
 54

NPN Bipolar Transistor

Allows current flow when high potential at base (middle)

 55

PNP Bipolar Transistor

Allows current flow when low potential at base (middle)

 56

Darlington Transistor

Made from 2 bipolar transistors. Has total gain of the product of each gain.

 57

JFET-N Transistor

N-channel field effect transistor

58 

JFET-P Transistor

P-channel field effect transistor

 59

NMOS Transistor

N-channel MOSFET transistor

 60

PMOS Transistor

P-channel MOSFET transistor

Misc. Symbols
 61

Motor

Electric motor

 62

Transformer

Change AC voltage from high to low or low to high.

 6364

Electric bell

Rings when activated

 65

Buzzer

Produce buzzing sound

 66

Fuse

The fuse disconnects when current above threshold. Used to protect circuit from high currents.

   
 67

Bus

Contains several wires. Usually for data / address.

 68

Bus

 69

Bus

 70

Optocoupler / Opto-isolator

Optocoupler isolates connection to other board

 71

Loudspeaker

Converts electrical signal to sound waves

 72

Microphone

Converts sound waves to electrical signal

 73

Operational Amplifier

Amplify input signal

 74

Schmitt Trigger

Operates with hysteresis to reduce noise.

 75

Analog-to-digital converter (ADC)

Converts analog signal to digital numbers

 76

Digital-to-Analog converter (DAC)

Converts digital numbers to analog signal

 77

Crystal Oscillator

Used to generate precise frequency clock signal

Antenna Symbols
 78

Antenna / aerial

Transmits & receives radio waves

 79

Antenna / aerial

 80

Dipole Antenna

Two wires simple antenna

Logic Gates Symbols
 81

NOT Gate (Inverter)

Outputs 1 when input is 0

 82

AND Gate

Outputs 1 when both inputs are 1.

 83

NAND Gate

Outputs 0 when both inputs are 1. (NOT + AND)

 84

OR Gate

Outputs 1 when any input is 1.

 85

NOR Gate

Outputs 0 when any input is 1. (NOT + OR)

 86

XOR Gate

Outputs 1 when inputs are different. (Exclusive OR)

 87

D Flip-Flop

Stores one bit of data

 88

Multiplexer / Mux 2 to 1

Connects the output to selected input line.

 89

Multiplexer / Mux 4 to 1

 90

Demultiplexer / Demux 1 to 4

Connects selected output to the input line.

 

 

Call our Helpline on 0800 197 65 65 or Click to Email Us
Failed to Add to Basket