ELEC Q1 [SYMBOLS]

• What is the purpose of the electrical wire symbol?

  It represents a wire.
• What does the symbol for connected wires indicate?

  It indicates that the wires are connected at the crossing.
• What does the symbol for not connected wires show?

  It shows that wires are not connected at the crossing.
• What does the SPST toggle switch symbol represent?

  It represents a switch that disconnects current when open.
• What is the function of the SPDT toggle switch symbol?

  It selects between two connections.
• What does the push button (N.O) symbol denote?


  It denotes a momentary switch that is normally open.
• What does the push button switch (N.C) symbol represent?

  It represents a momentary switch that is normally closed.
• What is the purpose of the DIP switch symbol?

  It is used for onboard configuration.
• What does the SPST relay symbol indicate?

  It indicates a relay that closes connection by an electromagnet.
• What does the SPDT relay symbol show?

  It shows a relay that opens connection by an electromagnet.
• What does the earth ground symbol represent?

  It is used for zero potential reference and electrical shock protection.
• What does the chassis ground symbol indicate?

  It shows the wire connected to the chassis of the circuit.
• What does the digital ground symbol refer to?

  It refers to the reference voltage of digital-analog interface.
• What does the indicator symbol represent?

  It represents a coil or solenoid that generates a magnetic field.
• What does the iron core inductor symbol indicate?

  It indicates an iron core inductor which includes iron.
• What does the variable inductor symbol represent?

  It represents a coil or solenoid that has a variable magnetic field.
• What does the motor symbol indicate?

  It indicates a motor that changes electric energy to kinetic energy.
• What does the AC transformer symbol represent?

  It represents a transformer that changes AC voltage from high to low or low to high.
• What does the variable resistance symbol indicate?

  It indicates an adjustable resistor which has 2 terminals.
• What does the potentiometer symbol represent?

  It represents an adjustable resistor that has 3 terminals.
• What does the trimmer resistor symbol denote?

  It denotes a trimmer which is also known as a preset resistor.
• What does the thermistor symbol represent?

  It represents a thermal resistor that changes resistance with temperature changes.
• What does the photoresistor symbol indicate?

  It indicates a photo-resistor that changes resistance with light intensity change.
• What does the diode symbol represent?

  It allows current flow in one direction only - from left (anode) to right (cathode).
• What does the Zener diode symbol indicate?

  It allows current flow in one direction and can also flow in the reverse direction when above breakdown voltage.
• What does the Schottky diode symbol represent?

  It represents a diode with a low voltage drop.
• What does the varicap diode symbol represent?

  It represents a variable capacitance diode.
• What does the light emitting diode (LED) symbol indicate?

  It emits light when current flows through it.
• What does the photodiode symbol represent?

  It allows current flow when exposed to light.
• What does the capacitor symbol indicate?

  It is used to store electric charge and acts as a short circuit with AC and an open circuit with DC.
• What does the variable capacitor symbol represent?

  It represents an adjustable capacitance.
• What does the voltage source symbol indicate?

  It generates constant voltage.
• What does the current source symbol represent?

  It generates constant current.
• What does the AC voltage source symbol indicate?

  It shows the AC voltage source.
• What does the battery cell symbol represent?

  It is a single cell used to generate constant voltage.
• What does the battery symbol indicate?

  It represents a combination of two or more cells.
• What does the controlled voltage source symbol represent?

  It represents a constant voltage source that gives controllable voltage at the output.
• What does the controlled current source symbol indicate?

  It represents a controlled current source that gives controllable current at the output.
• What does the voltmeter symbol represent?


  It is used to measure voltage.
• What does the ammeter symbol indicate?

  It represents an ammeter whose work is to measure the current in the circuit.