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
Discussion:
28 comments Page 2 of 3.
ROHIT TOMER said:
1 decade ago
FIRST OF ALL EVEN IF diode follows ohm's law than going by definition of ohm's law "R" is a proportionality constant so as V increases I increases keeping are constant. As its a nonlinear device it doesn't follow ohm's law. So the question should be more clear whether he is asking for resistance by depletion layer or parasitic resistance.
RAMESH CRPF said:
1 decade ago
YES it is! because increase in current means increase in temperature so temp is inv.proportional to R.
Vivek said:
1 decade ago
As the current through diode increases heat is dissipated so more electrons in valence band jump to conduction band resulting further increase in current which is clear indication of decrease in resistance.
Sukhi said:
1 decade ago
As per the diode relation v i.e. voltage across the diode is fix V = IR. If current is increasing that is obviously decreasing the resistance.
Charul sharma said:
1 decade ago
For semiconductor ohm's law is not applicable think another When current flow due to semiconductor electron free so resistance is decrease.
Athithya said:
1 decade ago
According to ohm's law V = I/R.
So when current increases, resistance decreases.
So when current increases, resistance decreases.
Madhuri said:
1 decade ago
When conduction takes place in the circuit having a diode then the diode acts as conductor.
Neha said:
1 decade ago
R is the constant which has to overcome. The current increases when applied voltage increases, that is, once after overcoming the resistance quantity.
But w.r.t increasing current, the resistance is small not decreasing.
But w.r.t increasing current, the resistance is small not decreasing.
Akansha said:
1 decade ago
It's a fact that when resistance decrease, (act as an obstacle) current increase.
Vipul gupta said:
1 decade ago
I think the internal resistance must be the same but only the actual resistance changes.
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