Electricity - Questions

4. Which of the following are correct units of potential difference?
a.    Amp per Ohm
b.    Watt per Amp
c.    Newton per Coulomb
d.    Joule per second per Amp
e.    Joule per Second
f.     Coulomb per Joule
g.    Joule per Amp Second
h.    Newton per amp
i.     Joule per Coulomb