Question Detail
Question
How is the electromotive force (e.m.f.) of a battery defined according to the text?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Page 10 defines e.m.f. as "the potential difference across the terminals of a battery (or any other generator) on open circuit, that is, when no current is flowing."
Hint
EMF is related to the maximum potential difference a source can provide, typically measured when it's not delivering current.