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.
Jayanthi said:
1 decade ago
Thank for saying voltage drop through led.
Amit said:
1 decade ago
To akansha LED is always operated in forwar bais. Not reverse.
Anoth note to all friends.
If question said IDEAL DIOD then voltage drop is 0.
Anoth note to all friends.
If question said IDEAL DIOD then voltage drop is 0.
Sapana said:
1 decade ago
Is all type of LED has the same voltage drop?
Anbu said:
1 decade ago
I think the Led drop volatage will vary according to the various leds like red, blue, so normally we can judge 1.5v na?
Renu said:
1 decade ago
Is every led has same voltage drop i.e. 1. 5?
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.
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)
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)
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?
Sandeep said:
1 decade ago
1.5 is substaract for Red Led only? if there is Yellow Led then will we subtract 2 ?
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