Concept explainers
Calculate the value of
Answer to Problem 91P
The value of
Explanation of Solution
Given data:
Refer Figure 3.127 in the textbook for the transistor circuit.
The common-emitter current gain
The base-emitter voltage
Formula used:
Write the expression for collector current in transistor.
Here,
Write the expression for emitter current of transistor.
Calculation:
The Thevenin resistance of the input circuit is the parallel combination of
The Thevenin voltage of the input circuit is the voltage across
Modify the Figure 3.127 with the incorporation of Thevenin equivalent circuit as shown in Figure 1.
Apply Kirchhoff’s voltage law to input loop in Figure 1.
Substitute equation (2) in (3).
Substitute
Simplify the above equation as follows.
From Figure 1, write the expression for voltage
Substitute equation (2) in (4).
Substitute
Apply Kirchhoff’s voltage law to output loop in Figure 1.
Substitute equation (1) in (6).
Substitute
Conclusion:
Therefore, the value of
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Chapter 3 Solutions
Fundamentals of Electric Circuits
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