Electronics - Diodes and Applications - Discussion
Discussion Forum : Diodes and Applications - General Questions (Q.No. 9)
9.
What is the current through the LED?
Discussion:
35 comments Page 2 of 4.
Garry said:
1 decade ago
Led resistance varies with voltage {IV char}.
Garry said:
1 decade ago
When current flowing through led, due to internal resistance voltage drop across led.
Akash said:
1 decade ago
What is voltage drop of led?
Sujitha said:
1 decade ago
How to find led drop voltage?
Raja said:
1 decade ago
Is somebody ask how do we know on which color led it is then?
Sandeep said:
1 decade ago
1.5 is substaract for Red Led only? if there is Yellow Led then will we subtract 2 ?
Uma said:
1 decade ago
Someone said that LED has resistance so there is voltage drop ! I want to know, what is resistance of LED ? And how can we measure that?
Surendra said:
1 decade ago
LEDcolour Forward voltage (volt).
1. Infrared 1.3 to 1.5.
2. Red 1.5 to 1.8.
3. Yellow 2 to 2.2.
4. Green 2.2 to 2.4.
5. Blue 3 to 5.
1. Infrared 1.3 to 1.5.
2. Red 1.5 to 1.8.
3. Yellow 2 to 2.2.
4. Green 2.2 to 2.4.
5. Blue 3 to 5.
(1)
Ravi Shankar Kumar said:
1 decade ago
If you don't remember the forward voltage of the LED then use simple common sense that if that(LED) is not there then current in the circuit will be 18mA so if it is present then current must be lesser than 18mA because of resistance offered by LED ,only option is 13mA which is lesser than 18mA :P
(1)
Srivalli said:
1 decade ago
Typically, a LED forward voltage is about 1.8–3.3 volts; it varies by the color of the LED. A red LED typically drops 1.8 volts, but voltage drop normally rises as the light frequency increases, so a blue LED may drop around 3.3 volts.
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