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When switch S in the figure is open, the voltmeter V of the battery reads 3.08 {\rm V}. When the switch is closed, the voltmeter reading drops to 2.98 {\rm V}, and the ammeter A reads 1.64 {\rm A}. Assume that the two meters are ideal, so they don't affect the circuit.

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a) Find the emf.

b) Find the internal resistance of the battery

c) Find the circuit resistance R.

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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For the circuit shown in Figure P18.48, the voltmeter reads 6.0 V and the ammeter reads 3.0 mA. Find (a) the value of R, (b) the emf of the battery and (c) the voltage across the 3.0 kΩ resistor. (d) What assumptions did you have to make to solve this problem? 

 

For the circuit shown in Figure P18.48, the voltmeter reads 6.0 V and the ammeter reads 3.0 m.A. Find (a) the value of R,(b) the emf of the battery, and (c) the voltage across the 3.0-kΩ resistor. (d) What assumptions did you have to make to solve this problem?

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Consider the circuit shown. (Intro 1 figure) 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.

  1. What is the reading V of the voltmeter?
    Express your answer in terms of the EMF EMF.
  2. The voltmeter, as can be seen in the figure, is connected to points 1 and 3. What are the respective voltage differences between points 1 and 2 and between points 2 and 3?
  3. What is the reading I of the ammeter?
    Express your answer in terms of EMF and R.
  4. What is the reading of the ammeter now?
    Express your answer in terms of EMF, r, and R.
  5. What is the reading of the voltmeter now?
    Express your answer in terms of EMF, r, and R.

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