The diode current, i terms of voltaveV, is approximately given by

I=I.{exp(eV/kT)-1} where e=1.6^-19 coulomb is the electronic charge, k=1.38^-23joule k=boltzmann constant and T-temp. in K

if the saturation current I. is 1ηA, cal the forward and reverse resistances at V=0.2 and T=300K[/FONT]

Thanks a lot.