Solving for Vc, Vb, Ve, Ib, Ic and Ie

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In summary, using KVL, the values for Vc, Vb, Ve, Ib, Ic, and Ie were calculated to be 3.75V, 3.05V, 0.305A, and 9.9mA, respectively. However, it was determined that the circuit is saturated due to the base current being negligible. Thévenin's theorem was also suggested as an alternative method of analysis.
  • #1
eehelp150
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Homework Statement


Find Vc, Vb, Ve, Ib, Ic, and Ie
Vbe is 0.7V

upload_2016-10-31_12-41-50.png


Homework Equations


KVL

The Attempt at a Solution


Vb = (10*30k)/(80k) = 3.75V
Ve = Vb-Vbe = 3.05V
Ie = Ve/Re = 0.305A
Icmax = 10/(1010) = 9.9mA
Ie is much greater than 9.9mA, so this circuit is saturated. Is this correct?
 

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  • #2
eehelp150 said:
Vb = (10*30k)/(80k) = 3.75V
This is true iff the base current is zero or negligible.

It is better to apply Thévenin and say VB = 3.75 – IB×30k||50k

Q still turns out to be saturated, yes.
 
  • #3
1. Substitute labels for the resistors, like R1, R2 etc. Substitute actual values only at the end.
2. Write Σi = 0 at the base and emitter junctions. Let Ve = Vb - 0.75V. Gives you 4 independent equations in 4 unknowns.
3. Assume no saturation and solve for ib, Vb, Ve and Vc. If Vc turns out to be < Ve your equations were invalid and you have saturation.
 

Related to Solving for Vc, Vb, Ve, Ib, Ic and Ie

1. What is the importance of solving for Vc, Vb, Ve, Ib, Ic, and Ie?

Solving for these variables is essential in understanding the behavior of a circuit and predicting its performance. These values represent voltage and current at specific points in a circuit, which can help determine the efficiency, stability, and functionality of the circuit.

2. How do you solve for Vc, Vb, Ve, Ib, Ic, and Ie?

The process of solving for these variables involves using Ohm's Law and Kirchhoff's Circuit Laws, along with the given circuit diagram and component values. By applying these laws and equations, a system of equations can be formed, which can then be solved using algebraic methods.

3. Can you provide an example of solving for Vc, Vb, Ve, Ib, Ic, and Ie?

Sure, let's say we have a simple circuit with a battery, a resistor, and a capacitor. By using Ohm's Law, we can solve for Vc (voltage across the capacitor) by dividing the current (Ic) by the capacitance (C). Similarly, we can use Kirchhoff's Laws to solve for Vb (voltage across the battery) and Ve (voltage across the resistor).

4. What factors can affect the values of Vc, Vb, Ve, Ib, Ic, and Ie?

The values of these variables can be affected by various factors such as the type and values of the components in the circuit, the voltage and current supply, and the overall circuit design. Changes in any of these factors can result in different values for Vc, Vb, Ve, Ib, Ic, and Ie.

5. How can solving for Vc, Vb, Ve, Ib, Ic, and Ie be useful in real-world applications?

Solving for these variables is crucial in designing and troubleshooting electronic circuits. It can help engineers and scientists understand the behavior of a circuit, identify and fix any issues, and optimize the performance of the circuit. These values are also essential in creating safety mechanisms and determining the power consumption of a circuit.

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