
Concept explainers
(a)
Find the two-component Thevenin equivalent of the network
(a)

Answer to Problem 63E
The Thevenin equivalent resistance is
Explanation of Solution
Formula used:
The expression for the equivalent resistor when resistors are connected in series is as follows:
Here,
The expression for the equivalent resistor when resistors are connected in parallel is as follows:
Here,
The
o
Refer to the redrawn Figure 1:
The expression for the conversion of
Here,
Calculation:
To find equivalent resistance of a circuit the independent voltage source is replaced by short circuit
The redrawn circuit diagram is given in Figure 2:
Refer to the redrawn Figure 2:
Substitute
Rearrange the equation for
The simplified circuit diagram is given in Figure 3:
Refer to the redrawn Figure 3:
Substitute
Substitute
Substitute
The simplified circuit diagram is given in Figure 4.
Refer to the redrawn Figure 4:
Substitute
Substitute
Substitute
Rearrange the equation for
The simplified circuit diagram is given in Figure 5.
Refer to the redrawn Figure 5:
Substitute
The simplified circuit diagram is given in Figure 6.
Refer to the redrawn Figure 6:
So, the Thevenin equivalent resistance is
The redrawn circuit diagram is given in Figure 7.
Refer to the redrawn Figure 7:
Apply KCL at node 1:
Here,
Substitute
Rearrange for
Apply KCL at node 2:
Here,
Substitute
Rearrange for
Apply KCL at node 3:
Here,
Substitute
Rearrange for
The equations (7), (9) and (11) can be written in matrix form as:
Therefore, by Cramer’s rule,
The determinant of the coefficient matrix is as follows:
The 1st determinant is as follows:
The 2nd determinant is as follows:
The 3rd determinant is as follows:
Simplify for
Simplify for
Simplify for
So, the Thevenin voltage
Conclusion:
Thus, the Thevenin equivalent resistance is
(b)
Find the power dissipated by a
(b)

Answer to Problem 63E
Thepower dissipated by a
Explanation of Solution
Given Data:
The load resistance is
Formula used:
The expression for the power dissipated by a resistor is as follows:
Here,
Calculation:
The redrawn circuit diagram is given in Figure 8.
Refer to the redrawn Figure 8:
The expression for the current flowing in the circuit is as follows:
Here,
Substitute
Substitute
Conclusion:
Thus, the power dissipated by a
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