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Find the equivalent resistance of the ne...

Find the equivalent resistance of the network shown in the figure between the points A and B if
(i) `V_(A) gt V_(B) ` (ii) `V_(A) lt V_(B)`

Text Solution

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(i) When `V_(A) gt V_(B)` the diode is forward biased. Hence, the resistance of diode will be taken as zero. So the equivalent resistance is `4 xx 12/4+12 Omega = 3 Omega`
(ii) When `V_(A) lt V_(B)`, the diode is reverse biased. Hence, there will be no current in the diode branch. So, the equivalent resistance is` 12 Omega.`
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