Electrical symbols and electronic symbols

Electrical symbols and electronic circuit symbols are used to draw a schematic Picture.

Electrical Symbols Table

Symbol Component Sense
Wire symbols
Electrical Wiring Conductor of electrical current
Connected wires Connected junction
Wires not connected Cables are not connected
Switch symbols and relay symbols
SPST Toggle Switch Disconnect power when open
SPDT Toggle Switch Select between two connections
Button switch (NO) Momentary switch - normally open
Push Button Switch (NC) Momentary switch - normally closed
Dip switch DIP switch is used for onboard configuration
SPST Relay Open / close relay connection by electromagnet
SPDT Relay
Jumper Close the connection by inserting a jumper across the pins.
Solder Bridge Solder to close the connection
Ground symbols
Ground Used for zero potential reference and protection against electric shock.
Chassis floor Connected to circuit chassis
Digital/Common Earth  
Resistor symbols
Resistor (IEEE) Resistor reduces current flow.
Resistor (IEC)
Potentiometer (IEEE) Adjustable resistor - has 3 terminals.
Potentiometer (IEC)
Variable resistor / rheostat (IEEE) Adjustable resistor - has 2 terminals.
Variable resistor / rheostat (IEC)
Shear resistor Preset resistor
Thermistor Thermal resistance: changes resistance when temperature changes
Photoresistor / light dependent resistor (LDR) Photoresistance: changes resistance with change in light intensity
Capacitor symbols
Capacitor The capacitor is used to store electrical charge. Acts as short circuit with AC and open circuit with DC.
Polarized capacitor Electrolytic capacitor
Polarized capacitor Electrolytic capacitor
Variable capacitor Adjustable capacitance
Inductor / coil symbols
Inductor Coil / solenoid that generates magnetic field
Iron core inductor Includes iron
Variable inductor  
Power supply symbols
Voltage source Generates constant voltage
Current source Generates constant current.
AC voltage source AC voltage source
Generator The electrical voltage is generated by mechanical rotation of the generator.
Battery cell Generates constant voltage
Battery Generates constant voltage
Controlled voltage source Generates voltage as a function of the voltage or current of another element in the circuit.
Controlled current source Generates current as a function of the voltage or current of another element in the circuit.
Meter symbols
Voltmeter Measure voltage. It has a very high resistance. Connected in parallel.
Ammeter Measures electrical current. It has a near zero resistance. Connected in series.
Ohmmeter Measures resistance
Wattmeter Measures electrical energy
Lamp / bulb symbols
Lamp / bulb Generates light when current flows
Lamp / bulb
Lamp / bulb
Diode / LED symbols
Diode The diode allows current to flow in one direction: left (anode) to right (cathode).
Zener diode Allows current to flow in one direction, but can also flow in the reverse direction when above the breakdown voltage
Schottky diode The Schottky diode is a diode with low voltage drop.
Varactor diode/varicap Variable capacitance diode
Tunnel diode  
Light-emitting diode (LED) The LED emits light when current flows
Photodiode The photodiode allows current to flow when exposed to light
Transistor symbols
NPN Bipolar Transistor Allows current to flow when there is high potential at the base (center)
PNP bipolar transistor Allows current to flow when the potential is low at the base (center)
Darlington Transistor Made from 2 bipolar transistors. It has total profit of the product of each profit.
JFET-N Transistor N-Channel Field Effect Transistor
JFET-P transistor P channel field effect transistor
NMOS transistor N-Channel MOSFET Transistor
PMOS transistor P-Channel MOSFET Transistor
Misc. Symbols
Motor Electric motor
Transformer Change AC voltage from high to low or low to high.
Electric bell Sounds when activated
Buzzer Produces a buzzing sound
Fuse The fuse trips when the current exceeds the threshold. It is used to protect the circuit from high currents.
Bus Contains several cables. Generally for data / address.
Optocoupler / Optoisolator The optocoupler isolates the connection to another board
Loudspeaker Converts the electrical signal into s-waveshonors
Microphone Converts sound waves into electrical signals
Operational amplifier Amplify the input signal
Schmitt Trigger Functions with hysteresis to reduce noise.
Analog-to-Digital Converter (ADC) Converts the analog signal to digital numbers
Digital-to-analog converter (DAC) Converts digital numbers to analog signal
Crystal oscillator It is used to generate a precise frequency clock signal
Continuous stream Continuous current is generated from a constant voltage level
Antenna symbols
Antenna / antenna Transmits and receives radio waves
Antenna / antenna
Dipole antennas Simple two-wire antenna
Logic Gate Symbols
NO gate (inverter ) Outputs 1 when input is 0
And gate Outputs 1 when both inputs are 1.
NAND Gate Outputs 0 when both inputs are 1. (NO + Y)
OR gate Outputs 1 when any input is 1.
NOR Gate Outputs 0 when any input is 1. (NO + O)
XOR Gate Outputs 1 when inputs are different. (Exclusive or)
D Flip-Flop Stores a bit of data
Multiplexer/Mux2 to 1 Connect the output to the selected input line.
Multiplexer/Mux 4 to 1
Demultiplexer/Demux 1 to 4 Connect the selected output to the input line.