Question

Find Vab (PN diode is ideal).
(1)10V
(2) 20 V
(3)30V
(4) 40 V​

Answer 1

HEYA MATE YOUR ANSWER IS

3) 30v

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Answer 2

Given :

external voltage = 30V

PN diode is ideal.

To find:

$V_{AB}$  ?

Solution:

There are 2 loops in the figure.

When PN diode is forward biased it acts as a conductor .

Hence it can be replaced by a wire .

Draw the equivalent  resistance diagram.

firstly 2 resistors are in parallel

.$\frac{1}{R} = \frac{1}{10} + \frac{1}{10}$

 R = 5

then the two resistors are in series. hence R = R1 + R2

$R_{eq}$= 15ohm

V = IR (ohms law)

I = $\frac{30}{15}$ = 2 amp

voltage drop across R =10 ohms = 10×2 = 20V

hence

$V_{AB} = 10V$

voltage across AB is equal to 10V.