diodes and LEDs

• Diode

  A component that allows current to flow in one direction only
• Diode

  • Has a very high resistance in the reverse direction
  • Current can only flow in the forward direction
• Light-emitting diode (LED)


  A type of diode that gives off light when current flows through it
• LED

  • Same symbol as a diode but with arrows coming off
  • Extremely energy-efficient source of light
• Current-potential difference graph of a diode

  • No current can flow in the reverse direction
  • In the forward direction, current increases as potential difference increases
• Diodes and LEDs are extremely useful for controlling the flow of current in circuits
• LEDs are found in many electronic devices and appliances