(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

See attachment

2. Relevant equations

We are to assume the voltage drop across diodes is .7v (don't use the diode equation!).

3. The attempt at a solution

I first was assuming that both diodes were "on". Then my work is as follows:

V1 is the voltage directly above diode D1 (the left most diode)...

[tex]I+ \frac{V_{1}-.7-(-5)}{5k\Omega}=\frac{5-V_{1}}{10k\Omega}[/tex]

[tex]I+ \frac{.7-.7+5}{5k\Omega}=\frac{5-.7}{10k\Omega}[/tex]

[tex]I=-.57mA[/tex]

Now since I is negative, one of my assumptions is wrong? So now I assume the rightmost one is "off" (D2).

So.. then

Solving for I

[tex]I = \frac{5-.7}{10k\Omega}[/tex]

[tex]I = .43 mA[/tex]

Solving for V

Well.. since theres no current, v=-5?

Am I approaching this correctly?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Diode Circuit Problem

**Physics Forums | Science Articles, Homework Help, Discussion**