# Analyzing circuit with Silicon and Zener diode

1. Jun 19, 2014

### JasonHathaway

1. The problem statement, all variables and given/known data

Determine Vout, the current flowing through R and power power dissipated the Zener diode.

2. Relevant equations

Circuit analyzing techniques.

3. The attempt at a solution

I've done this problem by assuming each diode is off while ignoring the other.

E.g. Applying KVL: -24+VD=0 --> VD=24 (Silicon diode is on and will be replaced with 0.7V voltage source).
Applying KVL again: -24-VDZ --> VDZ=-24 (Zener diode is reverse biased and will be replaced with VZT, which 12V voltage source).

Is this approach correct?

2. Jun 19, 2014

### Staff: Mentor

Can you explain why someone might construct this crcuit?

3. Jun 19, 2014

### CWatters

That was a good hint from NascentOxygen.

Make sure you understand what Zener diodes are commonly used for.

4. Jun 19, 2014

### rude man

Not a good idea. Why do you assume the diodes are off? They're not.

5. Jun 19, 2014

### Staff: Mentor

Poster is closely following a generalized technique he has been taught. Assume one "state" and prove or disprove it is true. With experience, will be able to short-circuit his procedures.