Electrical Engineering Symbol
Electrical Engineering Symbol
Electrical Engineering Symbol
Electrical symbols and electronic circuit symbols are used for drawing schematic diagram. The symbols represent electrical and electronic components.
Component name
Meaning
Wire Symbols
Electrical Wire Conductor of electrical current
Connected Wires
Connected crossing
DIP Switch
Jumper
Solder Bridge
Ground Symbols
Earth Ground Used for zero potential reference and electrical shock protection.
Chassis Ground
Resistor Symbols
Resistor (IEEE) Resistor reduces the current flow. Resistor (IEC)
Variable Resistor / Rheostat (IEEE) Adjustable resistor - has 2 terminals. Variable Resistor / Rheostat (IEC)
Trimmer Resistor
Preset resistor
Thermistor
Capacitor Symbols
Capacitor Capacitor is used to store electric charge. It acts as short circuit with AC and open circuit with DC. Capacitor
Polarized Capacitor
Electrolytic capacitor
Polarized Capacitor
Electrolytic capacitor
Variable Capacitor
Adjustable capacitance
Includes iron
Variable Inductor
Current Source
AC Voltage Source
AC voltage source
Generator
Battery Cell
Battery
Generates voltage as a function of voltage or current of other circuit element. Generates current as a function of voltage or current of other circuit element.
Meter Symbols
Voltmeter Measures voltage. Has very high resistance. Connected in parallel. Measures electric current. Has near zero resistance. Connected serially.
Ammeter
Ohmmeter
Measures resistance
Wattmeter
Diode
Diode allows current flow in one direction only (left to right). Allows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage
Zener Diode
Schottky Diode
Tunnel Diode
Photodiode
Transistor Symbols
NPN Bipolar Transistor Allows current flow when high potential at base (middle)
Darlington Transistor
Made from 2 bipolar transistors. Has total gain of the product of each gain.
JFET-N Transistor
JFET-P Transistor
NMOS Transistor
PMOS Transistor
Misc. Symbols
Motor Electric motor
Transformer
Electric bell
Buzzer
Fuse The fuse disconnects when current above threshold. Used to protect circuit from high currents. Fuse
Bus
Bus
Bus
Optocoupler / Opto-isolator
Loudspeaker
Microphone
Operational Amplifier
Schmitt Trigger
Crystal Oscillator
Antenna Symbols
Antenna / aerial Transmits & receives radio waves Antenna / aerial
Dipole Antenna
AND Gate
NAND Gate
OR Gate
NOR Gate
XOR Gate
D Flip-Flop
Multiplexer / Mux 2 to 1 Connects the output to selected input line. Multiplexer / Mux 4 to 1
Demultiplexer / Demux 1 to 4