Physics, 21.11.2019 05:31 yrodrig13

4.38 a diode operates in a series circuit with a resistance r and a dc source v. a designer, considering using a constant-voltage model, is uncertain whether to use 0.7 v or 0.6 v for vd. for what value of v is the difference in the calculated values of current only 1%? for v = 3 v and r = 1 k! , what two current estimates would result from the use of the two values of vd? what is their percentage difference?

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Answer from: yuser7865

a. V=9.4V

b. $i_{D1}=2.3x10^{-3}A$

$i_{D2}=2.4x10^{-3}A$

Explanation:

Using law Ohm to find the current in the circuit with a diode and resistance R

$i_D=\frac{V-V_D}{R}$

$i_{D2}=1.01*i_{D1}$

$\frac{V-0.7}{R}=1.01*\frac{V-0.6}{R}$

(V-0.7)=1.01*(V-0.6)

V-0.7=1.01*V-0.606

$V=\frac{0.094}{0.01}=9.4V$

$i_{D1}=\frac{V-V_D}{R}$

$i_{D1}=\frac{3V-0.7}{1k}$

$i_{D1}=2.3x10^{-3}A$

$i_{D2}=\frac{3V-0.6}{1k}$

$i_{D2}=2.4x10^{-3}A$

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4.38 a diode operates in a series circuit with a resistance r and a dc source v. a designer, conside...

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