Electronic Devices - Special-Purpose Diodes - Discussion
Discussion Forum : Special-Purpose Diodes - General Questions (Q.No. 14)
14.
An LED is forward-biased. The diode should be on, but no light is showing. A possible trouble might be
Discussion:
8 comments Page 1 of 1.
Mahesh said:
5 years ago
A LED if forward biased, will be on and emitting light. If the series resistor is small, it should not affect the LED. If the power supply is high, the LED will glow more brightly or else it will burn.
If the LED is not glowing, then it only means that it is open meaning it is disconnected from the circuit.
If the LED is not glowing, then it only means that it is open meaning it is disconnected from the circuit.
(1)
Suis Oicor said:
7 years ago
The LED operate only on Forward biased, meaning applying dc voltage considering the anode is connected in +supply and cathode is connected in -supply, so that the diode will on. But in case the LED is not turning on then the diode is open, which is the most common problem of the diodes.
Jagjit Singh said:
7 years ago
The LED operate only on reverse bias so if it is connected in forward bias then it should not operate so the answer C is correct i.e. the diode should be off if forward bias.
Jagjit Singh said:
7 years ago
The LED operate only on reverse bias so if it is connected in forward bias then it should not operate so the answer C is correct i.e. the diode should be off if forward bias.
Sai kiran said:
7 years ago
LED operates in forward bias not in reverse bias.
Reyneir Moseros said:
9 years ago
LED operates only in reverse-bias.
Shailesh Patel said:
1 decade ago
If they taken LED as diode?
And if diode is open how it LED comes ON?
And if diode is open how it LED comes ON?
D.durga said:
1 decade ago
Because there is no current flow in case of diode is open.
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