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 1 of 3.

Vinay said:   5 years ago
but I had a query?

That is in diode internal resistance is nothing but the internal voltage of 0.7(si) and 0.3(ge) which is constant. Then why it is solved by ohm's law?

Akshay said:   6 years ago
We can see in the characteristics of a diode. It's slope (1/R) increases on increasing current, thus it means that are will decrease.

Jay said:   6 years ago
When forward current increase then due to power dissipation some temp increase due to temp more electrons and holes created due to this majority charge carriers increase some amount so so conductivity increase so resistivity decrease resistance decrease.

Gtej said:   6 years ago
Dynamic resistance is the same as linear resistance true or false?

Please tell me.

Mohit said:   8 years ago
Actual reason for this answer.

Semiconductors are having negative temperature coefficient so when current increases due to this temperature also increase and because of this resistance decreases.
(1)

Parmar vijaykumar said:   9 years ago
Diode has dynamic resistance that is reason increasing in I cause to decrease in R.

Abdul Haleem said:   9 years ago
In diode internal resistance (i.e Rd = 0.7 ohm) will be same for all current.

Kumar prabhat said:   9 years ago
Relation between R and I is inversely proportional. Diode current increases so resistance decreases.

Vipul gupta said:   9 years ago
I think the internal resistance must be the same but only the actual resistance changes.

Akansha said:   10 years ago
It's a fact that when resistance decrease, (act as an obstacle) current increase.


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