Electrical Components and Their Symbols

Wires and Traces

Component Name	Symbol
Wires or Conductor
Trace Junction or Connected Wires
Trace Crossing or Unconnected Wires

Grounds

Component Name	Symbol
Ground or Earth
Signal Ground
Chassis Ground

Sources

Component Name	Symbol
Single Cell
Battery (Combination of cells)
Photovoltaic Cell (Solar Cell)
Independent or Constant Voltage Source
Controlled or Dependent Voltage Source
Independent or Constant Current Source
Controlled or Dependent Current Source
AC voltage Source

Resistors

Component Name	Symbol
Fixed Resistor
Rheostat (Variable Resistor)
Potentiometer
Thermistor or Varistor

Capacitors

Component Name	Symbol
Non-polarized Capacitor
Polarized Capacitor
Variable Capacitor
Trimmer Capacitor

Inductors

Component Name	Symbol
Air Cored Inductor
Iron Cored Inductor
Tapped Inductor

Transformers

Component Name	Symbol
Transformer
Center Tapped Transformer
Step up Transformer
Step Down Transformer
Transformer with two secondary windings
Current Transformer
Potential Transformer
Zero Sequence Current Transformer (ZSCT)

Diodes

Component Name	Symbol
PN Junction Diode
Schottky Diode
Zener Diode
Light Emitting Diode (LED)
Photo Diode
Tunnel Diode
Varicap (Variable Capacitor Diode)
Schockley Diode
Constant Current Diode
Silicon Controlled Rectifier (SCR)
Diac

Transistors

Component Name	Symbol
N-channel, Junction Field Effect Transistor ( JFET)
P-channel, Junction Field Effect Transistor (JFET)
Metal Oxide Semiconductor Field Effect Transistor (MOSFET)
Enhancement Mode, N-channel MOSFET
Enhancement Mode, P-channel MOSFET

Bipolar Transistors

Component Name	Symbol
NPN Bipolar Junction Transistor (BJT)
PNP Bipolar Junction Transistor (BJT)

Vacuum Tubes

Component Name	Symbol
Vacuum Tube Diode
Vacuum Tube Triode
Vacuum Tube Tetrode
Vacuum Tube Pentode

Switches

Component Name	Symbol
Single Pole Single Throw (SPST) Switch
Single Pole Double Throw (SPDT) Switch
Double Pole Single Throw (DPST) Switch
Normally Open (NO) Push Button Switch
Normally Closed (NC) Push Button Switch
Relay Switch

Lamps

Component Name	Symbol
Indicating Lamp
Neon Lamp
Light Bulb

Current Limiters

Component Name	Symbol
IEC Fuse
IEEE/ANSI Fuse

Electro – Acoustic Devices

Component Name	Symbol
Microphone (IEC Standard)
Microphone (IEEE Standard)
Buzzer
Loudspeaker

Antennas

Component Name	Symbol
Antenna
Dipole Antenna
Loop Antenna (IEC Standard)
Loop Antenna (IEEE Standard)

Logic Gates

Component Name	Symbol
OR
AND
NOT
NAND
NOR
XOR
XNOR

Miscellaneous Devices

Component Name	Symbol
Voltmeter
Ammeter
Galvanometer
Electric Motor
Crystal Oscillator