# help me with diode equation ?

Discussion in 'Homework Help' started by unclebehrooz, Oct 1, 2012.

1. ### unclebehrooz Thread Starter New Member

Oct 1, 2012
2
0
our Professor asked me to prove the equation of dynamic resistance of diode , he want me to explain him where did the equation come from !

the equation is this : [r]_{}[/AC]=[n.[V]_{}[/T]]/[/_{}[/Q]]

r is for resistance
[V]_{}[/T] stands for thermal voltage
_{}[/Q] is the I at operating point of diode

so if you know how it has made , please let your friend knows it too

2. ### WBahn Moderator

Mar 31, 2012
18,080
4,917
It's hard to follow your notation. How about making it a bit easier for those whom you are asking for free assistance and format your equations using tex. There's a sticky at the top of the Homework Help forum that tells you how.

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3. ### Ron H AAC Fanatic!

Apr 14, 2005
7,050
657
Here's a hint: Dynamic resistance is dV/dI (change in voltage divided by change in current).
Do you know the diode equation?

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