Concepts  [ENDORSED]

Moderators: Chem_Mod, Chem_Admin

Posts: 51
Joined: Mon Jun 17, 2019 7:24 am


Postby KeiannaPineda1B » Tue Feb 18, 2020 7:32 pm

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

Posts: 18901
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 734 times

Re: Concepts  [ENDORSED]

Postby Chem_Mod » Wed Feb 19, 2020 9:39 pm

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

Postby Jocelyn Thorp 1A » Sat Feb 22, 2020 8:33 pm

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.

Return to “Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)”

Who is online

Users browsing this forum: No registered users and 2 guests