This is about thermal expansion of water So if there are two glasses of water, one of them is +7°c and the other one is -7°c which one of them has more volume?
Options
a) +7°c
b) -7°c
c) both of them are the same
d) it’s impossible to know

1 volt = 1 joule per coulomb

It takes 1 joule of work to force a coulomb of charge enough closer to a charge
with the same sign to raise its potential 1 volt.

If you allow 1 coulomb of charge to fall to where its potential is 1 volt less,
it gives up 1 joule of energy.