Question

The forward characteristic curve of a junction diode is shown in Figure 4 below :

Calculate the resistance of the diode at

(1) V = 0.5 V

(2) I = 60 mA

Answer 1

Resistance of Diode

V = 0.5 V

At V = 0.5V, I = 40 mA

We know that V =  IR

`:. R = V/I = 0.5/(40xx10^(-3)) = 12.5` Ω

∵ I = 60 mA

we get V = 0.6

`:. R = V/I =- 0.6/(60xx10^(-3)) = 10 Ω`