Electricity

• Diode

  • Only allows current to flow through it in one direction
• Rectifier

  A component that turns an alternating current (repeatedly changes direction) into a direct current (one direction)
• Diodes act as rectifiers

  They block the alternating current when it changes direction
• Thermistor

  A component that resistance changes with its temperature
• Thermistor

  • Increasing temperature usually decreases the resistance
• LDR (Light Dependent Resistor)

  A component whose resistance changes with light intensity
• LDR

  • Increasing light intensity usually decreases the resistance
• Circuit Diagram (Symbols)

  Filament Lamp

  
• Circuit Diagram (Symbols)

  Resisitor

  
• Circuit Diagrams (Symbols)

  Thermistor