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.
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.
Madhuri said:
1 decade ago
When conduction takes place in the circuit having a diode then the diode acts as conductor.
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.
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.
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.
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.
RAMESH CRPF said:
1 decade ago
YES it is! because increase in current means increase in temperature so temp is inv.proportional to R.
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.
Narendra singh lodhi said:
1 decade ago
Vt/I dynamic resistance .
so r increases
so r increases
Poonam patel said:
1 decade ago
A real diode has 2 components to the forward resistance. One is the apparent resistance of the PN junction and that decreases with increasing current. The other is a parasitic resistance and it is assumed to be constant.
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