How do you calculate e.m.f.?

How do you calculate e.m.f.? How do you calculate e.m.f. of a cell? what are the formulas for it? thank you! Additional Details p.s.: How do you find internal resistance?? is that like simple resistance or is there some "special" formula for finding it?? i tried google... but it's hard... show more How do you calculate e.m.f.?
How do you calculate e.m.f. of a cell?

what are the formulas for it?

thank you!

Additional Details

p.s.: How do you find internal resistance?? is that like simple resistance or is there some "special" formula for finding it??

i tried google... but it's hard when you don't know what you are searching for.

Nernst equation does not apply because i do not have all of that info...
6 answers 6