From what i understand, EMF is the energy given to each unit of charge, which allows it to flow around a circuit. Why do the charges need energy? Is the energy they recieve converted to kinetic energy?

Now, voltage really confuses me. Is voltage measured in volts? Or is voltage and the volt completely unrelated? According to my book, 1 joule per coulomb is equal to 1 volt, but my teacher is saying that voltage is the pushing force of charges in a circuit.

And then theres potential difference...my book explains it in a way that i just dont understand.

Pretty much everyone in my class is having the same problems. I think the way the book explains things is a bit hard to grasp. So if anyone could maybe explain these terms, that would be great.

Thanks,

Dan.