Electromotive force (emf)


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Matthew Tsai 2H
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

Electromotive force (emf)

Postby Matthew Tsai 2H » Thu Mar 05, 2020 10:05 pm

Can someone explain what emf is exactly and if we need to know anything about it other than that it represents max work?

Dina 2k
Posts: 57
Joined: Wed Sep 18, 2019 12:17 am

Re: Electromotive force (emf)

Postby Dina 2k » Thu Mar 05, 2020 10:23 pm

the book mentions that EMF is the same as the cell potential of a cell.

Sanjana Borle 2K
Posts: 111
Joined: Fri Aug 09, 2019 12:15 am

Re: Electromotive force (emf)

Postby Sanjana Borle 2K » Thu Mar 05, 2020 10:26 pm

I think all we need to know is that EMF is the same thing as the cell potential, or the variable E, so if a problem refers to emf it is just referring to E.

EvanWang
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

Re: Electromotive force (emf)

Postby EvanWang » Thu Mar 05, 2020 10:58 pm

And also, maximum nonexpansion work is the same as Gibbs free energy, so emf directly relates to

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

Re: Electromotive force (emf)

Postby Jocelyn Thorp 1A » Fri Mar 06, 2020 1:43 am

it's the voltage of the cell

Miriam Villarreal 1J
Posts: 105
Joined: Sat Aug 17, 2019 12:16 am

Re: Electromotive force (emf)

Postby Miriam Villarreal 1J » Fri Mar 06, 2020 10:43 am

Emf is given a positive value if the cell reaction is spontaneous. This implies that the electrode on the left forces electrons into the external circuit and the electrode on the right withdraws them

On the other hand, Emf is given a negative value if the cell reaction is nonspontaneous. This implies that if the half-cell on the right side of the shorthand cell notation is releasing electrons, making the right-hand terminal of the voltmeter negative

Sreyes_1C
Posts: 90
Joined: Fri Sep 28, 2018 12:19 am

Re: Electromotive force (emf)

Postby Sreyes_1C » Sat Mar 07, 2020 11:16 pm

if its the same as cell potential I would assume we don't need to know much more about it

005384106
Posts: 101
Joined: Sat Aug 24, 2019 12:16 am

Re: Electromotive force (emf)

Postby 005384106 » Sun Mar 08, 2020 1:18 pm

How do you calculate for EMF?

005384106
Posts: 101
Joined: Sat Aug 24, 2019 12:16 am

Re: Electromotive force (emf)

Postby 005384106 » Sun Mar 08, 2020 1:20 pm

Why do we measure the voltage difference of two cells?

Julia Holsinger_1A
Posts: 50
Joined: Tue Feb 26, 2019 12:16 am

Re: Electromotive force (emf)

Postby Julia Holsinger_1A » Wed Mar 11, 2020 5:02 pm

005384106 wrote:Why do we measure the voltage difference of two cells?

The difference in potential voltage is what gives rise to electric current


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