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The problem set in the image involves analyzing circuits with diodes, and for each configuration, you need to determine the current or voltage based on the diode model.

Let's break down the tasks:

### Problem 5:
You are asked to **determine the current I** for each configuration in **Fig. 2.155**. Here's a guide for each circuit:
- **Fig. 2.155(a)**: This circuit has a silicon diode in series with a resistor and a 12V source. Assume the silicon diode has a forward voltage drop of 0.7V.
  - Use Ohm's law: \( I = \frac{V_{source} - V_{diode}}{R} \)
- **Fig. 2.155(b)**: Two silicon diodes in series with resistors and a 20V source.
  - The voltage drop across two diodes would be \( 2 \times 0.7V \).
  - Again, use Ohm's law to find the current.
- **Fig. 2.155(c)**: A silicon diode in parallel with a resistor and a 10V source.
  - Here, the current flows directly through the resistor, as the diode is reverse biased and doesn't conduct.

### Problem 6:
You are asked to determine **\( V_o \)** and **\( I_D \)** for the circuits in **Fig. 2.156**:
- **Fig. 2.156(a)**: A silicon diode with a resistor, with a -5V source.
  - Check if the diode is forward or reverse biased to determine whether it conducts.
  - If forward biased, calculate the current and \( V_o \) (across the diode).
- **Fig. 2.156(b)**: Similar analysis with an 8V source and a different resistor configuration.

### Problem 7:
You need to determine the **output voltage \( V_o \)** for each network in **Fig. 2.157**.
- **Fig. 2.157(a)**: A series of two diodes (silicon and germanium) and resistors.
  - Forward voltage for a silicon diode is approximately 0.7V, and for a germanium diode, it's around 0.3V.
  - Subtract these voltage drops from the source voltage to find \( V_o \).
- **Fig. 2.157(b)**: A different combination with a 10V source.

### Problem 8:
For **Fig. 2.158**, you're asked to determine **\( V_o \)** and **\( I_D \)** for two circuits:
- **Fig. 2.158(a)**: A current source and two resistors in parallel with a diode.
  - The current splits between the two resistors.
- **Fig. 2.158(b)**: A 20V source and a resistor in series with a diode, similar to previous problems.

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Would you like detailed step-by-step solutions for each problem? Here are 5 related questions to help deepen your understanding:

1. How does the forward voltage drop of a diode affect the current in a circuit?
2. What is the behavior of a silicon diode in reverse bias, and how does it impact circuit analysis?
3. Why do silicon and germanium diodes have different forward voltage drops, and how does this affect \( V_o \)?
4. How would the analysis change if the diodes were ideal (i.e., with no forward voltage drop)?
5. In the circuits with multiple diodes, how do you account for the voltage drop across each diode in series?

**Tip:** Always check whether the diode is forward or reverse biased before applying Ohm's law to calculate current or voltage.

Determine the current I for each configuration of Fig. 2.155, determine Vo and ID for Fig. 2.156, Vo for Fig. 2.157, and Vo and ID for Fig. 2.158.

Solve a set of diode circuit problems using Ohm's law and diode models. This tutorial covers current and voltage calculations for series and parallel diode circuits in Fig. 2.155 to Fig. 2.158, suitable for university-level electrical engineering courses.

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