What is the difference between emf and terminal potential difference?

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I thought they were the same, but on the specification, they are listed individually...

Posted Fri 1st November, 2013 @ 16:38 by Hoosierette

1 Answer

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I can't work out how to delete this now that I've found the answer, so I will instead post the answer here for anyone else who may want it: 

The terminal potential difference of a supply is the pd it provides which is available to the circuit. This is not the same as the emf as the total emf is never available to a circuit due to a cell’s internal resistance. It is calculated using Vt=ε-Ir.

Answered Fri 1st November, 2013 @ 20:40 by Hoosierette