Concept explainers
For the circuits of Figure P2.42, determine the resistor values (including the power rating) necessaryto achieve the indicated voltages. Resistors are available in
(a)
The values of the resistors which is necessary to achieve the indicated voltage.
Answer to Problem 2.42HP
The value of all the given ratings is greater than
Explanation of Solution
Calculation:
The given diagram is shown in Figure 1.
To calculate the value of the resistance
The total current in the circuit is calculated as,
The expression to calculate the power rating across the resistance
Substitute
The available ratings of the resistance are
Conclusion:
Therefore, the value of all the given ratings is greater than
(b)
The values of the resistors which is necessary to achieve the indicated voltage.
Answer to Problem 2.42HP
The value of all the given ratings is greater than
Explanation of Solution
Calculation:
The given diagram is shown in Figure 2
To calculate the value of the resistance
Substitute
The expression for the total current in the circuit is given by,
Substitute
The expression to calculate the power rating across the resistance
Substitute
The expression to calculate the power rating across the resistance
Substitute
The available ratings of the resistance are
Conclusion:
Therefore, the value of all the given ratings is greater than
(c)
The values of the resistors which is necessary to achieve the indicated voltage.
Answer to Problem 2.42HP
The power rating across the load must be
Explanation of Solution
Calculation:
The given diagram is shown in Figure 3.
To calculate the value of the resistance
The expression for the total current in the circuit is given by,
Substitute
The expression to calculate the power rating across the resistance
Substitute
The power rating among the ratings
Conclusion:
Therefore, the power rating across the load must be
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Chapter 2 Solutions
Principles and Applications of Electrical Engineering
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