要英文回答.Explain,intermsofenergy,thedifferencebetweenpotentialdifference(p.d.)andelectromotiveforce(e.m.f.).

Question

要英文回答.
Explain,in terms of energy,the difference between potential difference (p.d.) and
electromotive force (e.m.f.).

Answer 1

Potential Difference is the difference in electric potential energy per coulomb of charge at one point of a circuit compared to the charge at another point in a circuit.
Electromotive Force is the force which drives the electrons.
Lets get this straight,from a more practical,and less wordy perspective."emf" stands for electromotive force.That describes voltage,or a pressure created by a large number of electrons at any given point,such as that across the terminals of a battery.
Potential difference is that difference between 2 or more conductors.This can also be the description of that large number of electrons at any given point.The potential difference between the negative and positive terminals of a 12 volt battery,is 12 volts.The Potential difference between a black wire in house wiring,and the white wire in said house wiring is 220 Volts AC.Potential difference is any difference between two dissimilar voltages,or charges.