Homework CH 25

Homework CH 25 - Measurements in Electric Circuits Learning...

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Measurements in Electric Circuits Learning Goal: To understand the role of the internal resistance of various devices and the use of the ammeter and the voltmeter. Consider the circuit shown. All wires are considered ideal; that is, they have zero resistance. We will assume for now that all other elements of the circuit are ideal, too: The value of resistance is a constant, the internal resistances of the battery ( ) and the ammeter ( ) are zero, and the internal resistance of the voltmeter ( ) is infinitely large. Part A What is the reading of the voltmeter? Express your answer in terms of the EMF . ANSWER: = Correct Part B The voltmeter, as can be seen in the figure, is connected to points 1 and 3. What are the respective voltages between points 1 and 2 and between points 2 and 3? ANSWER:
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Measurements in Electric Circuits Part A Correct Part C What is the reading of the ammeter? Express your answer in terms of and . ANSWER: = Correct To make things more interesting, we now assume that the battery has a nonzero internal resistance (the voltmeter and the ammeter remain ideal).
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Measurements in Electric Circuits Part D What is the reading of the ammeter now? Express your answer in terms of , , and . ANSWER: = Correct Part E What is the reading of the voltmeter now? Hint E.1 Using Ohm's law Hint not displayed Express your answer in terms of , , and . ANSWER: = Correct
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Now assume that the ammeter has nonzero resistance . The battery still has nonzero internal resistance. Part F Compared to their values when , how would the readings of the ammeter and the voltmeter change when ? Hint F.1 How to approach this part Hint not displayed ANSWER: The ammeter reading would increase; the voltmeter reading would stay the same. The ammeter reading would decrease; the voltmeter reading would stay the same. The ammeter reading would decrease; the voltmeter reading would increase. The ammeter reading would increase; the voltmeter reading would increase. Correct Part G What is the new reading of the ammeter? Express your answer in terms of , , , and . ANSWER:
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Homework CH 25 - Measurements in Electric Circuits Learning...

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