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SYMBOLS ELECTRICAL TABLE

 

Table of Electrical Symbols





SymbolComponent nameMeaning
Wire Symbols
electrical wire symbolElectrical WireA conductor of electrical current
connected wires symbolConnected WiresConnected crossing
unconnected wires symbolNot Connected WiresWires are not connected
Switch Symbols and Relay Symbols
SPST switch symbolSPST Toggle SwitchDisconnects current when open
SPDT switch symbolSPDT Toggle SwitchSelects between two connections
push button symbolPushbutton Switch (N.O)Momentary switch - normally open
push button symbolPushbutton Switch (N.C)Momentary switch - normally closed
dip switch symbolDIP SwitchDIP switch is used for onboard configuration
spst relay symbolSPST RelayRelay open / close connection by an electromagnet
spdt relay symbolSPDT Relay
jumper symbolJumperClose connection by jumper insertion on pins.
solder bridge symbolSolder BridgeSolder to close connection
Ground Symbols
earth  ground symbolEarth GroundUsed for zero potential reference and electrical shock protection.
chassis symbolChassis GroundConnected to the chassis of the circuit
common digital ground symbolDigital / Common Ground 
Resistor Symbols
resistor symbolResistor (IEEE)Resistor reduces the current flow.
resistor symbolResistor (IEC)
potentiomemer symbolPotentiometer (IEEE)Adjustable resistor - has 3 terminals.
potentiometer symbolPotentiometer (IEC)
variable resistor symbolVariable Resistor / Rheostat (IEEE)Adjustable resistor - has 2 terminals.
variable resistor symbolVariable Resistor / Rheostat (IEC)
Trimmer ResistorPreset resistor
ThermistorThermal resistor - change resistance when temperature changes
Photoresistor / Light dependent resistor (LDR)Photo-resistor - change resistance with light intensity change
Capacitor Symbols
CapacitorCapacitor is used to store electric charge. It acts as short circuit with AC and open circuit with DC.
capacitor symbolCapacitor
polarized capacitor symbolPolarized CapacitorElectrolytic capacitor
polarized capacitor symbolPolarized CapacitorElectrolytic capacitor
variable capacitor symbolVariable CapacitorAdjustable capacitance
Inductor / Coil Symbols
inductor symbolInductorCoil / solenoid that generates magnetic field
iron core inductor symbolIron Core InductorIncludes iron
variable core inductor symbolVariable Inductor 
Power Supply Symbols
voltage source symbolVoltage SourceGenerates constant voltage
current source symbolCurrent SourceGenerates constant current.
ac power source symbolAC Voltage SourceAC voltage source
generator symbolGeneratorElectrical voltage is generated by mechanical rotation of the generator
battery cell symbolBattery CellGenerates constant voltage
battery symbolBatteryGenerates constant voltage
controlled voltage source symbolControlled Voltage SourceGenerates voltage as a function of voltage or current of other circuit element.
controlled current source symbolControlled Current SourceGenerates current as a function of voltage or current of other circuit element.
Meter Symbols
voltmeter symbolVoltmeterMeasures voltage. Has very high resistance. Connected in parallel.
ammeter symbolAmmeterMeasures electric current. Has near zero resistance. Connected serially.
ohmmeter symbolOhmmeterMeasures resistance
wattmeter symbolWattmeterMeasures electric power
Lamp / Light Bulb Symbols
lamp symbolLamp / light bulbGenerates light when current flows through
lamp symbolLamp / light bulb
lamp symbolLamp / light bulb
Diode / LED Symbols
diode symbolDiodeDiode allows current flow in one direction only - left (anode) to right (cathode).
zener diodeZener DiodeAllows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage
schottky diode symbolSchottky DiodeSchottky diode is a diode with low voltage drop
varicap diode symbolVaractor / Varicap DiodeVariable capacitance diode
tunnel diode symbolTunnel Diode 
led symbolLight Emitting Diode (LED)LED emits light when current flows through
photodiode symbolPhotodiodePhotodiode allows current flow when exposed to light
Transistor Symbols
npn transistor symbolNPN Bipolar TransistorAllows current flow when high potential at base (middle)
pnp transistor symbolPNP Bipolar TransistorAllows current flow when low potential at base (middle)
darlington transistor symbolDarlington TransistorMade from 2 bipolar transistors. Has total gain of the product of each gain.
JFET-N transistor symbolJFET-N TransistorN-channel field effect transistor
JFET-P transistor symbolJFET-P TransistorP-channel field effect transistor
nmos transistor symbolNMOS TransistorN-channel MOSFET transistor
pmos transistor symbolPMOS TransistorP-channel MOSFET transistor
Misc. Symbols
motor symbolMotorElectric motor
transformer symbolTransformerChange AC voltage from high to low or low to high.
bell symbolElectric bellRings when activated
buzzer symbolBuzzerProduce buzzing sound
fuse symbolFuseThe fuse disconnects when current above threshold. Used to protect circuit from high currents.
fuse symbolFuse
bus symbolBusContains several wires. Usually for data / address.
bus symbolBus
bus symbolBus
optocoupler symbolOptocoupler / Opto-isolatorOptocoupler isolates connection to other board
speaker symbolLoudspeakerConverts electrical signal to sound waves
microphone symbolMicrophoneConverts sound waves to electrical signal
operational amplifier symbolOperational AmplifierAmplify input signal
schmitt trigger symbolSchmitt TriggerOperates with hysteresis to reduce noise.
Analog-to-digital converter (ADC)Converts analog signal to digital numbers
Digital-to-Analog converter (DAC)Converts digital numbers to analog signal
crystal oscillator symbolCrystal OscillatorUsed to generate precise frequency clock signal
Direct currentDirect current is generated from constant voltage level
Antenna Symbols
antenna symbolAntenna / aerialTransmits & receives radio waves
antenna symbolAntenna / aerial
dipole antenna symbolDipole AntennaTwo wires simple antenna
Logic Gates Symbols
NOT gate symbolNOT Gate (Inverter)Outputs 1 when input is 0
AND gate symbolAND GateOutputs 1 when both inputs are 1.
NAND gate symbolNAND GateOutputs 0 when both inputs are 1. (NOT + AND)
OR gate symbolOR GateOutputs 1 when any input is 1.
NOR gate symbolNOR GateOutputs 0 when any input is 1. (NOT + OR)
XOR gate symbolXOR GateOutputs 1 when inputs are different. (Exclusive OR)
D flip flop symbolD Flip-FlopStores one bit of data
mux symbolMultiplexer / Mux 2 to 1Connects the output to  selected input line.
mux symbolMultiplexer / Mux 4 to 1
demux symbolDemultiplexer / Demux 1 to 4Connects selected output to the input line.

 

NameElectrical SymbolAlternate SymbolDescription
ground/earthground symbolThis symbol identifies an earth(ground) terminal used for a zero potential reference point and electrical shock protection.
equipotentialequi-potentiality symbolequipotential symbolIt is a symbol to identify parts with the same voltage (i.e., the same electrical potential or equipotential). Since equipotential surfaces all have the same voltage, you won't be shocked if you touch two such surfaces unless you are also touching another part with a different potential from the first two parts.
chassis groundchassis symbolalternate chassis symbolIt is a link between different metallic parts of a machine to ensure an electrical connection between them. It must not be considered as a link to the earth.
batterybattery symbolbattery symbol alternateIt is a device that consists of one or more electrochemical cells with external connections to empower electrical devices and generates constant voltages.
resistorresister symbolresister symbol alternateIt is an electrical component that reduces the electric current, for example, to limit the current passing through an LED. A resistor is used with a capacitor in a timing circuit.
attenuatorattenuator symbolattenuator alternateIt is an electronic device that reduces the power of a signal with appreciably distorting its waveform, which is the opposite of an amplifier.
capacitorcapacitorcapacitor symbolIt is a device with two terminals, which stores electric energy. The effect of a capacitor is known as capacitance. It can also be used as a filter to block DC signals but pass AC signals.
accumulatoraccumulator symbolIt is an energy storage device that accepts, stores, and releases energy, increasing or relieving pressure in the system.
antennaantenna symbolAn antenna also knows as an aerial, is a device designed to transmit or receive electromagnetic (e.g., TV or radio) waves.
loop antennaloop antenna symbolA loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductors with its ends connected to a balanced transmission line.
crystalcrystalcrystal symbolA crystal oscillator uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with an exact frequency.
circuit breakercircuit breakerA circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit.
fusefuse symbolfuseA fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit.
ideal sourceideal sourceideal source symbolAn ideal voltage source is a two-terminal device that maintains a fixed voltage drop across its terminals. It is often used in the simplified analysis process of a real electric circuit.
generic componentgeneric component symbolgeneric component alternate
transducertransducer symboltransducer alternateA transducer is a device that converts energy from one form to another. Usually, a transducer converts a signal in one type of power to a signal in another.
inductorinductor symbolmore inductor symbolA coil of wire creates a magnetic field when current passes through it. It may have an iron core inside the coil. It can be used as a transducer converting electrical energy to mechanical energy by pulling on something. It is a passive two-terminal electrical component used to store energy in a magnetic field.
half inductorhalf inductor symbol
pickup headpickup head symbolpickup head symbol alternate
pulsepulsepulse symbols alternate
saw toothsaw tooch line
step functionstep functionstep function symbol
explosive squibexplosive squib symbolExplosive squib is often used on stage and film to trigger various special effects.
sensing link squibsensing link squib symbol
squib ignitersquib igniter symbol
surge protectorssurge protectors symbolmore surge protectors symbol

surge protectors symbol alternate

Surge protectors protect your electronics from power surges in your electrical system.
instrumentindicator symbolindicator symbolsFor example, a voltmeter is an instrument used for measuring the electrical potential difference between two points in an electric circuit. The wattmeter is an instrument for measuring the electric power in watts of any given circuit.
materialmaterial symbolmore material symbol
delay elementdelay element symbolmore delay element symbolThe delay element provides a specified delay between the actuation of the propellant-actuated devices.
permanent magnetpermanent magnetA permanent magnet is a material or object that produces a magnetic field.
magnet coremagnet core
ferrite coreferrite coreferrite core symbol
igniter plugigniter plug symbol
bellelectrical bell symbolbell symbolsThe electric bell is found in an ordinary house doorbell, and when activated, it makes a ringing sound.
buzzerelectrical buzzer symbolbuzzer symbolAn electrical buzzer is similar to the bell that makes a constant buzz noise instead of a single tone or bell sound.
thermal elementthermal element symbols
thermocouplethermocouplethermocouple symbols
thermopilethermopile symbol
lamplamplamp symbolsA transducer converts electrical energy to light, used for a lamp providing illumination, for example, a car headlamp or torch bulb.
fluorescent lampfluorescent lampfluorescent lamp symbol
speakerspeaker symbolA speaker can take digital input and turn it into analog sound waves—one of the most important parts of a wide range of electrical products like TVs and telephones.
microphonemicrophonemicrophone symbols
oscillatoroscillator symbolsIt produces a repetitive electronic signal, often a sine wave or a square wave.
AC sourceAC source symbolAC source symbol AlternateAlternating Current, continually change direction.
DC sourceDC sourceDC source symbolDirect Current, always flow in one direction.









Electrical wiring construction including outlets, switches, and lamps.






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