Analyzing circuit with Silicon and Zener diode

In summary, the conversation is about determining Vout, the current through R, and the power dissipated by the Zener diode using circuit analysis techniques. The poster has attempted the problem by assuming each diode is off and using KVL, but is questioned on the validity of this approach. The purpose of the circuit is also discussed, with a hint given to the poster to understand the common use of Zener diodes. The poster's approach is explained as a generalized technique, which can be improved with experience.
  • #1
JasonHathaway
115
0

Homework Statement



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

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Homework Equations



Circuit analyzing techniques.

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?
 
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  • #2
Can you explain why someone might construct this crcuit?
 
  • #3
That was a good hint from NascentOxygen.

Make sure you understand what Zener diodes are commonly used for.
 
  • #4
JasonHathaway said:

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


Not a good idea. Why do you assume the diodes are off? They're not.
 
  • #5
rude man said:
Not a good idea. Why do you assume the diodes are off? They're not.
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.
 

FAQ: Analyzing circuit with Silicon and Zener diode

1. What is the purpose of a Silicon diode in a circuit?

A Silicon diode is used to allow current to flow in one direction while blocking the flow in the opposite direction. This property makes it useful for rectifying AC current into DC current.

2. How does a Zener diode differ from a Silicon diode?

While a Silicon diode only allows current to flow in one direction, a Zener diode also has a specific breakdown voltage that allows it to conduct in the reverse direction. This makes it useful for voltage regulation and protection in a circuit.

3. How do I analyze a circuit with Silicon and Zener diodes?

To analyze a circuit with these diodes, you will need to use Kirchhoff's circuit laws and Ohm's law to calculate the current and voltage at different points in the circuit. You will also need to consider the specific characteristics of each diode, such as their forward and reverse voltage ratings.

4. Can I use a Silicon diode instead of a Zener diode in a circuit?

No, a Silicon diode cannot be used as a replacement for a Zener diode. While they may have similar physical appearances, their properties and functions are different. A Silicon diode will not have the same breakdown voltage as a Zener diode and will not function in the same way.

5. What are the common applications of circuits with Silicon and Zener diodes?

Circuits with these diodes are commonly used in power supplies, voltage regulators, and surge protectors. They can also be used in electronic devices to convert AC to DC current or to protect sensitive components from overvoltage.

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