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Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

Discussion Forum : Electronic Devices and Circuits - Section 1 (Q.No. 10)
Electronic Devices and Circuits
10.
In the circuit of figure the function of resistor R and diode D are
to limit the current and to protect LED against over voltage
to limit the voltage and to protect LED against over current
to limit the current and protect LED against reverse breakdown voltage.
none of the above.
Answer: Option
Explanation:

Resistance limits current and diode is reverse connected and therefore protects LED against reverse breakdown.

Discussion:
14 comments Page 2 of 2.
Abhishek said:   1 decade ago
Thanks for explanation.
SUKHVIR SINGH said:   1 decade ago
When led under reverse bias D is forward bias. So current find he path through D. Hence led is protected.
Aman said:   1 decade ago
Diode is in reverse bias when input voltage become more then breakdown for LED. Diode D becomes short circuit and bypass the current so LED protected.
Aayan said:   1 decade ago
I have a question how diode protect the led?
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