The starting point for the theory can be either Kirchhoff’s second law or conservation of energy in the circuit (the same thing really) but a general discussion based on the circuit diagram below should use a variety of approaches
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Superb resource for the teaching of this topic at A level. Explanations, practicals and worked questions with answers are all included. Part of the Advancing physics course. Measuring the internal resistance of a potato is a really useful activity to promote deeper understanding.
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