Concept explainers
In the circuit of Fig. 7.140, find vo and io, given that vs = 10[1 – e–t]u(t) V.
Find the output voltage
Answer to Problem 75P
The output voltage
Explanation of Solution
Given data:
Refer to Figure 7.140 in the textbook.
The value of capacitance
The source voltage
Formula used:
Write the general expression for the unit step function.
Calculation:
The given Figure 7.140 is redrawn as shown in Figure 1.
The given source voltage is,
Apply the unit step function in equation (1) to equation (2).
Consider the voltage at the non-inverting terminal as
For
Since the source voltage
For
The voltage,
On differentiating the equation (3).
In Figure 1, apply Kirchhoff’s current law at node
Substitute
Rearrange the equation as follows,
Simplify the equation as follows,
Apply the unit step function in equation (1) to equation (5).
The output current
Substitute
Convert the unit A to
Conclusion:
Thus, the output voltage
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Chapter 7 Solutions
Fundamentals of Electric Circuits
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