it takes 10 J of energy to move 2 C of charge from point A to point B. How large is the potential difference between points A and B

Ok so what we need to find is how large is the potential difference between points A and B.

Now you make a statement about what this potential difference would do in this problem

We now know that the points from A and B relies to transport a difference by using points A to B per unit change.

V
=
W/
q
=
50/
10
=
5
V=
q
W

=
10
50

=5 V (5 volt).

Honestly "global warming" may be a slight possiblity, however they called it "climate change" because its not real, in fact we had one of our coldest days here not too long ago, and the "issues" with this subject is a blindfold for actual problems.