First slide

Diodes

Question

Find the potential difference between A & B in the given circuit.

Moderate

A

0
B

5 volt
C

10 volt
D

15 volt

Solution

$D i o d e i s i n f o r w a r d b i a s a n d b e h a v e s l i k e c o n d u c t i n g w i r e . R_{e q} = 10 + \frac{10 \times 10}{10 + 10} = 15 k Ω$
$O h m' s L a w : C u r r e n t p a s \sin g t h r o u g h b a t t e r y i s i i = \frac{V}{R} = \frac{30}{10 + \frac{10 \times 10}{10 + 10}} = 2 m A$
$N o w, c u r r e n t w i l l d i v i d e i n t w o e q u a l p a r t s . i_{A B} = 1 m A$
$∴ P o t e n t i a l d r o p a c r o s s A B V_{A B} = i_{A B} R_{A B} = 10^{- 3} \times 10 \times 10^{3} = 10 V$

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