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Question:

The V-I characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is :

10

10𕒺

100

106

Solution:

V=IR
Rf=Vf/If=0.7/(10⁻⁵)=7×10⁴
In the similar way,
0.75/15=5×10⁴
and
0.8/20=4×10⁴
∴Rf=0.7/(4.75(10⁻⁵))=10
and
Rb=VB/IB=10/10⁻⁷=10⁷
∴Rf/Rb=10/10⁷=10⁻⁶