Using Fig. 9.43, design a problem to help other students better understand impedance.
Figure 9.43
Design a problem to make better understand about the impedance using Figure 9.43.
Explanation of Solution
Problem design:
Determine the value of current
Formula used:
Write the expression to convert the time domain expression into phasor domain.
Here,
A is the magnitude,
t is the time, and
Write the expression to calculate the phasor current.
Here,
Write the expression to calculate the impedance of the passive elements resistor, inductor and capacitor.
Here,
Calculation:
The Figure 9.43 is redrawn as Figure 1 by assuming the values for the passive elements.
Given voltage equation is,
Here, angular frequency
Use the equation (1) to express the above equation in phasor form.
Substitute
Substitute
Substitute
Substitute
Substitute
The Figure 1 is redrawn as impedance circuit in the following Figure 2.
Refer to Figure 2, the impedances
Write the expression to calculate the equivalent capacitance 1 for the parallel connected impedances
Here,
Substitute
The reduced circuit of the Figure 2 is drawn as Figure 3.
Refer to Figure 3, the impedances
Write the expression to calculate the equivalent capacitance 2 for the series connected impedances
Here,
Substitute
The reduced circuit of the Figure 3 is drawn as Figure 4.
Refer to Figure 4, the impedances
Write the expression to calculate the equivalent capacitance 3 for the parallel connected impedances
Here,
Substitute
The reduced circuit of the Figure 4 is drawn as Figure 5.
Refer to Figure 5, the impedances
Write the expression to calculate the equivalent capacitance 4 for the series connected impedances
Here,
Substitute
The reduced circuit of the Figure 5 is drawn as Figure 6.
Therefore, the equivalent impedance of the circuit in Figure 1 is,
Substitute
Use the equation (1) to express the above equation in time domain form.
Substitute
Therefore, the value of current
Conclusion:
Thus, the problem to make better understand about the impedance using Figure 9.43 is designed.
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