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Experiment 16 - Practical Comments II (Series Circuit)

Mix batteries

In a series circuit of batteries you should never mix fresh batteries with used batteries. From the experiment 8, you know that the internal resistances are added in a series circuit.

Use batteries of same capacity

This comment is closely connected with the last comment. In a series circuit you should only choose batteries of the same capacity . In a series circuit the same current flows through each battery. Therefore, the low capacity battery is exhausted more quickly.