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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 |  |
Updated on: 31-May-2021
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