Diodes and LEDs

• What should you be able to describe and explain by the end of the video?

  The shape of the current potential difference graph for a diode
• What is meant by a light emitting diode (LED)?

  An LED is a diode that emits light when current flows through it
• Why are diodes useful in circuits?

  They control the flow of current by allowing it to flow in one direction only
• What is the key feature of a diode?

  The current through the diode flows in one direction only
• What happens to the current when the potential difference increases in a diode?

  The current increases as the potential difference increases in the forward direction
• What does the symbol for a diode contain that indicates the direction of current flow?

  An arrow that shows the direction of conventional current flow
• What happens to the current when the diode is connected in reverse direction?

  The diode will not allow the current to pass through
• What is the current potential difference graph for a diode like in the reverse direction?

  No current can flow in the reverse direction
• How do LEDs differ from normal diodes?

  LEDs emit light when current flows through them
• Where can you commonly find LEDs?

  In electronic gadgets like camera flashes, LED light bulbs, and televisions
• Why are LEDs considered energy efficient?

  Because they provide a source of light with low energy consumption
• What are the characteristics of the current potential difference graph for a diode?

  • No current flows in the reverse direction
  • Current increases in the forward direction as potential difference increases
• What are the similarities and differences between a diode and a light emitting diode (LED)?

  Similarities:

  • Both allow current to flow in the forward direction only

  
  

  Differences:

  • LEDs emit light when current flows through them
  • Diodes do not emit light
• What are some common applications of LEDs?

  • Camera flashes
  • LED light bulbs
  • LED televisions
• What is the significance of the arrow in the diode symbol?

  • Indicates the direction of conventional current flow