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The V-I characteristic of a silicon diode is as show in the followingcalulate the resistance of the diode at (i) I_(D)=15 mA and (ii) V_(D)=10 V |
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Answer» SOLUTION :Thediode d characteristicscan beconsideredas astraightlinebetween`I=10` mAand I= 20mA. SoOhm.slawcan beused tocalculatethe resistance (fromgraph)and at`I=10 mAV=0.7 V` `:. ` Resistance`R_(fb) = (Delta V)/( Delta I)` `=(0.8 - 0.7)/( (20 - 10)m= (0.1 V)/(10 mA)` `=(0.1v)/( 10^(-2) A) =10 SIGMA ` (ii) At`V= -10 V,I = -1muA` `R_(fb)= (V)/(I)= = (-10V)/( -1 muA)= (10V)/(10^(-6) A) =10^(7) Sigma` 
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