OK, Bear with me, I'm a mature student returning to the sciences after a 16 year break... I'm currently reading up on electricity and cannot, for the life of me, get my head around what 'appears' to be an inconsistency. Obviously my brain isn't 'seeing' the answer properly just yet so I could do with some help. Basically, if one coulomb has 6.25 x 10 -18 electrons and 1 volt is the potential energy required to carry out 1 Joule of work how is it that 1 eV is only worth 1.602 x 10. -19 Joules??? Why not 6.25 X 10 -18 Joules? I've read around many sites but can't get my brain to shift into the right perspective with this... Cheers.