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electrical symbols
Wire Symbols

Electrical Wire
Conductor of electrical current

Connected Wires
Connected crossing

Not Connected Wires
Wires are not connected
Switch Symbols and Relay Symbols

SPST Toggle Switch
Disconnects current when open

SPDT Toggle Switch
Selects between two connections

Pushbutton Switch (N.O)
Momentary switch - normally open

Pushbutton Switch (N.C)
Momentary switch - normally closed

DIP Switch
DIP switch is used for onboard configuration

SPST Relay
Relay open / close connection by an electromagnet

SPDT Relay

Jumper
Close connection by jumper insertion on pins.

Solder Bridge
Solder to close connection
Ground Symbols

Earth Ground
Used for zero potential reference and electrical shock protection.

Chassis Ground
Connected to the chassis of the circuit

Digital / Common Ground Resistor Symbols

Resistor (IEEE)
Resistor reduces the 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)

Trimmer Resistor
Preset resistor

Thermistor
Thermal resistor - change resistance when temperature changes

Photoresistor / Light dependent resistor (LDR)
Photo-resistor - change resistance with light intensity change
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
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
Electrical
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