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• LED in operation takes electrical values of voltage (VF) and current (IF)
• Relationship between current and voltage : in operated LED, small changes in voltage brings to large change in current
• Relationship between current and luminous intensity : Brightness of LED is directly proportional to the current volume → To use LED at stable brightness it is necessary to control current
• Relationship between temperature and voltage : in operated LED, voltage decreases as temperature goes up

• Method of resistor in series
  

  

• Constant current drive