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    Can someone please explain how to do these questions. I'm not very good at circuits.
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    The oscilloscope is being used as a volt meter.

    for this type of internal resistance question you want to make a couple of measurements

    1. the open circuit potential across the battery - with an open circuit, i.e. no current flow this is equal to the EMF of the battery.

    2. the potential across the battery with a load resistor in circuit. in this situation a current flows through the internal resistance of the battery and therefore there is a potential across the internal resistor pointing in the opposite direction to the current flow.
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Updated: September 18, 2017

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