modified 8 years ago

Led test

01:17:29

When we given 5 V Dc In led with 150 ohm Rp resistor  then  you getting standard Led intensity 20 mA
When we set 70 ohm Rp resistor then LED can damage 
When we set 80 ohm Rp resistor then LED given 40 mA current 
Because LED maximum current pass 40 mA current
When we set 1 kohm that time LED given 3.19 mA current 

published 8 years ago

rich11292000

8 years ago

Best to stay at 20 mA or less. Leds have a negative temperature coefficient that rises nearly exponentially. The resistor provides a positive temperature coefficient at a linear rate. When they get hot the led will have decreased its resistance significantly, while the resistor will have increased its resistance slightly. Then current increases, which in turn increases heat, which in turn increases current, which in turn increases heat.

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