电子元器件符号 电子符号

Online Reference ELECTRICITY & ELECTRONICS Electrical terms Electrical units Electrical symbols Electronic components Electronic laws Links RAPID TABLES Add to Favorites Recommend Site Send Feedback About Home > Electricity & Electronics > Electrical symbols Electrical Symbols and Electronic Symbols Electrical and electronic circuit symbols are used for drawing schematic diagram. The symbols represent electrical and electronic components. Table of Electrical Symbols Symbol Component name Meaning 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 - normallyopen Pushbutton Switch (N.C) Momentary switch - normallyclosed DIP Switch DIP switch is used for onboardconfiguration SPST Relay Relay open / close connection by an electromagnet SPDT Relay Jumper Close connection by jumperinsertion on pins. Solder Bridge Solder to close connection Ground Symbols Earth Ground Used for zero potential referenceand electrical shock protection. Chassis Ground Connected to the chassis of thecircuit Digital / Common Ground 2010/3/16 ElectricalSymbols&ElectronicSy… rapidtables.com/…/electrical_symb… 1/5 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) 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 generatesmagnetic 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 voltage is generated by mechanical rotation of the generator Battery Cell Generates constant voltage 2010/3/16 ElectricalSymbols&ElectronicSy… rapidtables.com/…/electrical_symb… 2/5 Battery Generates constant voltage Controlled Voltage Source Generates voltage as a function of voltage or current of other circuit element. Controlled Current Source Generates current as a function of voltage or current of other circuit element. Meter Symbols Voltmeter Measures voltage. Has very highresistance. Connected in parallel. Ammeter Measures electric current. Has near zero resistance. Connected serially. Ohmmeter Measures resistance Wattmeter Measures electric power Lamp / Light Bulb Symbols Lamp / light bulb Generates light when current flows throughLamp / light bulb Lamp / light bulb Diode / LED Symbols Diode Diode allows current flow in onedirection only (left to right). Zener Diode Allows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage Schottky Diode Schottky diode is a diode withlow voltage drop Varactor / Varicap Diode Variable capacitance diode Tunnel Diode Light Emitting Diode (LED) LED emits light when currentflows through Photodiode Photodiode allows current flowwhen exposed to light Transistor Symbols NPN Bipolar Transistor Allows current flow when highpotential at base (middle) PNP Bipolar Transistor Allows current flow when lowpotential at base (middle) Made from 2 bipolar transistors. 2010/3/16 ElectricalSymbols&ElectronicSy… rapidtables.com/…/electrical_symb… 3/5 Darlington Transistor Has total gain of the product of each gain. 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 tolow or low to high. Electric bell Rings when activated Buzzer Produce buzzing sound Fuse The fuse disconnects when current above threshold. Used to protect circuit from high currents. Fuse Bus Contains several wires. Usually for data / address.Bus Bus Optocoupler / Opto-isolator Optocoupler isolates onnection toother board Loudspeaker Converts electrical signal tosound waves Microphone Converts sound waves toelectrical signal Operational Amplifier Amplify input signal Schmitt Trigger Operates with hysteresis toreduce noise. Analog-to-digital converter (ADC) Converts analog signal to digitalnumbers Digital-to-Analog converter (DAC) Converts digital numbers to analog signal Used to generate precise 2010/3/16 ElectricalSymbols&ElectronicSy… rapidtables.com/…/electrical_symb… 4/5 Crystal Oscillator Used to generate precisefrequency clock signal Antenna Symbols Antenna / aerial Transmits & receives radio waves Antenna / aerial Dipole Antenna Two wires simple antenna Logic Gates Symbols NOT 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.(NOT + AND) OR Gate Outputs 1 when any input is 1. NOR Gate Outputs 0 when any input is 1.(NOT + OR) XOR Gate Outputs 1 when inputs aredifferent. (Exclusive OR) D Flip-Flop Stores one bit of data Multiplexer / Mux 2 to 1 Connects the output to selected input line. Multiplexer / Mux 4 to 1 Demultiplexer / Demux 1 to 4 Connects selected output to theinput line. See also Electrical components Electrical units Capacitor Resistor Inductor Current Voltage Ohm's law © 2006-2008 RapidTables.com 2010/3/16 ElectricalSymbols&ElectronicSy… rapidtables.com/…/electrical_symb… 5/5 接地的