An electrical symbol is a small image used to represent an electrical or electronic device or function. They are also known as circuit symbols or schematic symbols as they are used in electrical schematics and diagrams.
Some basic electrical symbols include:
- Wires
- Diode
- Batteries
- Transformers
- Capacitors
- Resistors
- Inductors
- Fuses
- Switches
- Transistors
- Electromagnetic Relays
There are many electrical and circuit symbols used internationally around the world. While they are mostly standardized (i.e. the same electronic symbols are used in different countries), you will still find some international differences.
Below is a table of the most commonly used electrical symbols used in circuit diagrams. The symbols are used to represent both active and passive components.
| Name of Electrical/Electronic Symbol | Component | Circuit Symbol |
| Sources | Battery Cell |  |
| Battery |  | |
| DC Power Supply |  | |
| Variable DC Power Supply |  | |
| AC Power Supply |  | |
| Resistors | Resistor |  |
| Variable Resistor |  | |
| Potentiometer, Voltage Divider |  | |
| Light Dependent Resistor (LDR) |  | |
| Filament Bulb |  | |
| Thermistor |  | |
| Fuse |  | |
| Capacitors | Capacitor (Non-Polarised) |  |
| Variable Capacitor |  | |
| Polarised Capacitor, Electrolytic Capacitor |  | |
| Transformers | Iron-cored Transformer |  |
| Iron-cored Transformer (two Secondary Windings) |  | |
| Diodes | Junction Diode |  |
| Zener Diode |  | |
| Photo Diode |  | |
| Light Emitting Diode (LED) |  | |
| Diode Bridge |  | |
| Transistors | npn transistor |  |
| pnp Transistor |  | |
| n-Type Junction Field Effect Transistor (NJFET) |  | |
| p-Type Junction Field Effect Transistor (PJFET) |  | |
| Integrated Circuits | Integrated Circuit (IC) |  |
| Meters | Ammeter |  |
| Voltmeter |  | |
| Galvanometer |  | |
| Cathode Ray Oscilloscope (CRO) |  | |
| Amplifiers | Voltage Amplifier |  |
| Operational Amplifier (Op-Amp) |  | |
| Transducers | Motor |  |
| Microphone |  | |
| Loudspeaker |  |
Schematic Diagram Symbols
Below is a table of the most commonly used electrical symbols used in schematic diagrams to represent all of the different electronic devices and functions.
| Name of Electrical/Electronic Symbol | Schematic Symbol |
| Concealed Wiring |  |
| Conduit Wiring |  |
| Direct Concealed Wiring |  |
| Multiple Conductor Line |  |
| Tanking Wiring |  |
| Cable Termination |  |
| Branching Box |  |
| Electrical Appliance |  |
| Telecom Indication Socket Outlet |  |
| Arial Socket Outlet of TV and Radio |  |
| Florescent Lamp |  |
| Electric Bell |  |
| Electric Door Opener |  |
| Buzzer |  |
| Current Impulse Switch |  |
| Electric Line Permanent Point |  |
| One Way Single Pole Switch |  |
| One Way Two Pole Switch |  |
| Two Way Single Pole Switch |  |
| Intermediate Switch |  |
| Push Button Switch |  |
| Single Lamp |  |
| Dreamer Switch |  |
| Single Socket Outlet |  |
| Double Socket Outlet |  |
| Arial |  |
| Surface Wiring |  |
| Electric Motor |  |
| Electric Heater |  |
| Electric Water Heater |  |
| Electric Cooking Range |  |
| Refrigerator |  |
| Electrical Wiring Connection Symbol/Mark |  |
| Terminal Strip |  |
| Branching Box |  |
| Earthing |  |
| Electric Fuse |  |
| Electric Lamp |  |
| Socket Outlet |  |
| Electric Motor, Single Phase |  |
| Electric Motor, Three Phase |  |
| Electric Cell |  |
| Thermal & Electro magnetic trippers switch three Pole |  |
| Electric Measuring Instrument |  |
| Volt Meter |  |
| Electromagnetic Tripper Switch Single Pole |  |
| Magnetic Conductor with three Main Conduction |  |
| Washing Machine |  |
| Dish Washing Machine |  |
| Electric Meter |  |
| House Connection Box |  |
| Push Button Switch |  |
| Florescent Lamp’s Choke Coil |  |
| Starter of Florescent Lamp |  |
| Resistor |  |
| Inductance |  |
| Capacitor |  |
| Stair Case Time Switch |  |
| Rectifier |  |
| Transformer |  |
| Thermal Tripper Switch, Single Pole |  |
| Thermal Tripper Switch Three Pole |  |
| Main Switch |  |
| Electric Door Opener |  |
| Ear Phone |  |
| Power Pack |  |
| Circuit Breaker (MCCB) |  |
| Limit Switch |  |
| Electromagnet Conductor |  |
| Electromagnet Relay |  |
| Time Lag Relay |  |
| Generator DC |  |
| Generator AC |  |
| Motor AC & DC |  |
| Ampere Meter |  |
| Manual Multiple Switch single pole.Four way shown in single way. |  |
| Microphone |  |
| Loudspeaker |  |
| Electro Magnetic |  |
| Phase Line |  |
| Proper connection Line |  |
| Neutral Line |  |
| Earth Line |  |
| Signal Line |  |
| Distribution Box/Panel Board |  |
| Thermal Relay |  |
| Ceiling Rose |  |
| Magnetic Conductor Tripper Three Main Contact |  |
| Change Over Switch |  |
| Wire Overlay Crossing |  |
| Plug and Socket |  |
| Two-pin Plug socket(with & without switch) |  |
| Three-pin Plug socket(with & without switch) |  |
| Ceiling Lamp Outlet |  |
| Wall Lamp Outlet |  |
| Ceiling Fan |  |
| Bracket Fan |  |
| Exhaust Fan |  |
| Fan Regulator |  |
| Indicator Switch |  |
| Electromagnet Relay |  |
| Lamp (with Bracket) |  |
| AC Current |  |
| Direct and Alternating Current |  |
| Movable Iron Type Machine |  |
| Main Fuse Board (without Switch) |  |
| Main Fuse Board (with Switch) |  |
| Switchless Distribution Fuse Board |  |
| Distribution Fuse Board(with switch) |  |
| Air Circuit Breaker |  |
| Oil Circuit Breaker |  |
| Relay |  |
| Lighting Arrester |  |
| Starter (Motor) |  |
| Star Delta Starter |  |
| Emersion Heater |  |
| Hanging Lamp |  |
| Water Type Lamp |  |
| DC Current |  |
| Movable Permanent Magnetic Type Machine |  |
| Battery |  |
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