Question

When you connect a standalone battery to a voltmeter the voltmeter reads 5 V. (a) Assuming...

  1. When you connect a standalone battery to a voltmeter the voltmeter reads 5 V.

    1. (a) Assuming the voltmeter has a very high resistance, what is the approximate elec- tromotive force in the battery?

    2. (b) When you hook the same battery up to a circuit with a 15 Ohm resistor, you hook up the voltmeter to read the terminal voltage across the battery and it now reads 4.688 V instead of 5 V. What is the internal resistance of the battery?

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Answer #1

Internal resistance of the battery = 1 ohm

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