Forward to Reverse Resistance Ratio – Rankers Physics
Topic: Semiconductor Physics
Subtopic: P-N Junction Diode and its applications

Forward to Reverse Resistance Ratio

The approximate ratio of resistances in the forward and reverse bias of the PN-junction diode is :
\(10^2 : 1\)
\(10^{-2} : 1\)
\(1 : 10^{-4}\)
\(1 : 10^4\)

Solution:

Forward resistance of a diode is very small (\(approx 10\Omega\)), while its reverse resistance is extremely high (\(approx 10^5 \Omega\)). The ratio \(R_f / R_r\) is of the order of \(10^{-4}\), which corresponds to \(1 : 10^4\).

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