1. IT2001PA
Engineering Essentials (2/2)
Chapter 11 - LED Applications
Lecturer Name
lecturer_email@ite.edu.sg
Nov 20, 2012
Contact Number

2. Chapter 11 - LED Applications
Lesson Objectives
Upon completion of this topic, you should be able to:
 State and apply the ratings of a typical LED.
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3. Chapter 11 - LED Applications
Specific Objectives
Students should be able to :
 List the advantages of light emitting diode (LED).
 State the ratings of a typical LED.
 State the applications of LED and 7 segment display:
IT2001PA Engineering Essentials (2/2)

4. Chapter 11 - LED Applications
Ratings of a typical LED
Forward voltage ≈ 1.6 V
Current ≈ 20 mA
Colour; Red, Green, Yellow, White
depending on the material used in
the diode
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5. Chapter 11 - LED Applications
Advantages of the LED
 Long operating life
 Small size
 Low power dissipation
 Cheap
 High reliability
 Quick response to changes in
operating current
 Low operating voltage (1.2V to 2.4V)
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6. Chapter 11 - LED Applications
Disadvantages of the LED
 Easily damaged by
excessive voltage or current
 Low light output
 Only small area illumination
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7. Chapter 11 - LED Applications
Applications of the LED
 Status indicators in instruments
 Camera appliances
 Dashboard
 Computer terminals
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8. Chapter 11 - LED Applications
Next Lesson
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