Question

what happened when voltage when cells are connected in series​

Answer 1

Answer:

When cells are connected in series the value of the individual cells is added. A single cell can provide a small current for a long time, or a big current for a short time. Connecting cells in series increases the voltage, but does not make the cells last longer.

Explanation:

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Answer 2

When cells are connected in series the current passing through it remains the same while the voltage at each terminal changes