Concept explainers
A voltmeter used to measure Vo in the circuit in Fig. 2.129. The voltmeter model consists of an ideal voltmeter in parallel with a 250-kΩ resistor. Let Vs = 95 V, Rs = 25 kΩ, and R1 = 40 kΩ. Calculate Vo with and without the voltmeter when
- (a) R2 = 5 kΩ
- (b) R2 = 25 kΩ
- (c) R2 = 250 kΩ
Figure 2.129
(a)
Find the values of
Answer to Problem 69P
The values of
Explanation of Solution
Given data:
Calculation:
Case 1: with voltmeter
Refer to Figure 2.129 in the textbook.
When a voltmeter is connected to the circuit,
By using voltage division rule, write the expression for voltage
Substitute
Substitute
Case 2: without voltmeter
As there is no voltmeter is connected, by directly using voltage law, write the expression for voltage
Substitute
Conclusion:
Thus, the values of
(b)
Find the values of
Answer to Problem 69P
The values of
Explanation of Solution
Given data:
Calculation:
Case 1: with voltmeter
Substitute
Substitute
Case 2: without voltmeter
Substitute
Conclusion:
Thus, the values of
(c)
Find the values of
Answer to Problem 69P
The values of
Explanation of Solution
Given data:
Calculation:
Case 1: with voltmeter
Substitute
Substitute
Case 2: without voltmeter
Substitute
Conclusion:
Thus, the values of
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Chapter 2 Solutions
Fundamentals of Electric Circuits
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