First slide

Diodes

Question

In the figure, potential difference between A and B is:

Easy

A

zero
B

15V
C

10V
D

5V

Solution

Diode is in forward bias, so it will behave as conducting wire, so
$\begin{array}{l} T w o 10 k Ω a r e i n p a r a l l e l a n d i n s e r i e s w i t h t h i r d 10 k Ω . \\ U \sin g v o l t a g e d i s t r i b u t i o n, \\ V_{a b} = \frac{R_{1}}{R_{1} + R_{2}} \times E = \frac{5}{5 + 10} \times 30 = 10 V \end{array}$

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