How is the flow of electrons when Zn-carbon cells are connected in series?

2017-08-03 11:02 pm

I learnt that connecting cells in series can increase the voltage, but doesn't electron flowing from negative terminal (Zn) of the 1st cell flows to the positive terminal(carbon rod) of the 2nd cell?
Will H+ be reduced by this electron directly? If so, how would the voltage add up?

更新1:

I learnt that connecting cells in series can increase the voltage, but doesn't electron flowing from negative terminal (Zn) of the 1st cell flows to the positive terminal(carbon rod) of the 2nd cell? Will H+ be reduced by this electron directly? If so, how would the voltage add up?

回答 (1)

胡雪8°

2017-08-03 11:38 pm

Electrons only flow in external circuit, and there is no electron flows in chemical cell (including zinc-carbon cell).

The chemical reaction in the cell builds up the potential difference (voltage) between the two electrodes. Such potential difference acts as the driving force of current.

When cells are connected in series, the resultant potential difference (resultant voltage) is the sum of the potential differences of the cells.

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