## Concepts [ENDORSED]

$E_{cell} = E_{cell}^{\circ}-\frac{RT}{nF}\ln Q$

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KeiannaPineda1B
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Joined: Mon Jun 17, 2019 7:24 am

### Concepts

Could someone please clarify why the electromotive force represents the maximum potential difference?

Chem_Mod
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### Re: Concepts  [ENDORSED]

As I mentioned in class it is a definition.

The origin for the wording is the following:

Electromotive force - something that moves or tends to move electricity.

The apparent force that drives a current around an electrical circuit.

The "force" is chemical potential difference (voltage) between the terminals of the circuit.

It is defined as the maximum voltage difference when zero current is flowing.

Hope this helps.

Jocelyn Thorp 1A
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

### Re: Concepts

hi, another point is that it is the max potential difference for a reason. The potential difference is created by having a difference in charge, and this difference in charge is where the electromotive force comes from. When the cathode and anode are first connected, that's when there's a maximum potential difference, because there is the greatest difference in charge and the electrons have not started to move yet.

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