
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Transcribed Image Text:**Title: Calculating Circuit Current**
Calculate the current from Vs and the current going to Ground (bottom of the diagram) for the following circuit. Use the following parameters for the circuit:
- Vs = 10 V
- R1 = 470 ohms
- Vf for D1 and D2 = 2.1 V
- R2 = 110 ohms
Show your calculations.
**Diagram Explanation:**
- The circuit diagram consists of a voltage source (Vs) at the top.
- There are two resistors: R1 and R2. R1 is positioned before any diodes, and R2 is after.
- Two diodes, D1 and D2, are connected in series between the resistors.
- The circuit concludes with a ground connection at the bottom.
**Instructions for Calculation:**
To calculate the current through the circuit, consider these steps:
1. **Determine Total Voltage Drop Needed for Diodes:**
- Each diode has a forward voltage (Vf) of 2.1 V.
- Total Vf for both diodes = 2 * 2.1 V = 4.2 V.
2. **Calculate Voltage Drop Across Resistors:**
- Vs provides 10 V.
- Voltage left for R1 and R2 = Vs - Total Vf = 10 V - 4.2 V = 5.8 V.
3. **Calculate Total Resistance:**
- Add R1 and R2: Total resistance (Rt) = R1 + R2 = 470 ohms + 110 ohms = 580 ohms.
4. **Use Ohm’s Law to Calculate Current (I):**
- I = Voltage across resistors / Total resistance = 5.8 V / 580 ohms.
Through this process, students can find the current from Vs and the current flowing to the ground.
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