circuit symbols

• Circuit symbols:

  • open switch
  • closed switch
  • cell
  • battery
  • lamp
  • ammeter
  • voltmeter
  • resistor
  • variable resistor
  • thermistor
  • light dependent resistor (LDR)
  • diode
  • light emitting diode (LED)
  • fuse
• OPEN SWITCH:

  Makes the circuit NOT complete & to stop the flow of current.

  
• CLOSED SWITCH:

  COMPLETES the circuit & allows current to pass.

  
• CELL:

  Indicates a single cell battery that provides the potential difference (voltage) needed for the current to flow.

  • Provides energy to charge & push them in circuit.

  
• BATTERY:

  A combination of cells, supplying electricity to the circuit.

  
• bulb / LAMP:

  Illuminates & indicates when current passes through it.

  
• AMMETER:

  Used to MEASURE the CURRENT flowing through a circuit.

  • It's always connected in SERIES within the main loop
  • they have very tiny resistances that we ignore them in calculations

  
• VOLTMETER:

  MEASURES the POTENTIAL DIFFERENCE (voltage) across a component.

  • connected in PARALLEL across the component we're looking at

  
• RESISTOR:

  To limit current in the circuit, introducing RESISTANCE.

  
• VARIABLE RESISTOR:

  A resistor whose RESISTANCE can be ADJUSTED to CONTROL current flow in a circuit.

  
• THERMISTOR:

  A temperature-dependent resistor, meaning its RESISTANCE changes with temperature.

  
• LIGHT DEPENDENT RESISTOR (LDR):

  A resistor that CHANGES its RESISTANCE based on the LIGHT intensity it's exposed to.

  
• DIODE:

  Allows CURRENT to flow in only ONE DIRECTION, ensuring components are protected from reverse current.

  
• LIGHT EMITTING DIODE (LED):

  Emits LIGHT when current flows through it & also allows current to flow in only ONE DIRECTION.

  
• FUSE:

  Acts as a SAFETY device that breaks the circuit if the CURRENT becomes too HIGH.