Electronic Devices - Semiconductors - Discussion

Discussion Forum : Semiconductors - General Questions (Q.No. 5)
5.
As the forward current through a silicon diode increases, the internal resistance
increases.
decreases.
remains the same.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
28 comments Page 3 of 3.

Narvaneni.suresh said:   1 decade ago
According to ohms law V=IR. So the current is inversely proportional to resistance. The resistance decreases in forward bias.

Krishnakumar said:   1 decade ago
It doesn't obeys ohms law. Dynamic resistance is the only reason for this since it depends upon temperature and current.

Nitin said:   1 decade ago
Internal resistance rd= 26 mV/Diode current.

So it decreases when forward current increases.

Prithvi said:   1 decade ago
@prasanna, I too think the same. Semiconductors do not obey ohm's law.

PRASANNA said:   1 decade ago
But diode is a non-linear device. It does not obey ohms law.

S Chakraborty said:   1 decade ago
R is the constant of proportionality . So . we can't say that R will decrease as current increases as per Ohm's Law . Of course R will decrease in this case. In case of diode, the dynamic resistance is related to the current by R=(Thernmal Voltage )/ Current through the diode , at room temp R=(26 mv)/I. Hence the result.

SARAN said:   1 decade ago
R=V/I

Kanika said:   1 decade ago
According to ohms law V=IR.

So current is inversely proportional to resistance.

Hence as the current increases, resistance decreases.


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