A lot of questions about voltage change, etc?

Small correction .A joule is the work done when a force of 1 NEWTON is moved over 1 metre.A newton is m * gravity. F(newtons = M(kg) * g .where on earth g = close to 9.8 m/s^-2.So on other planets like the moon the force of gravity is less and a m of 1kg will weigh less.A unit charge is the charge transferred(number of electrons)when a current of 1 ampere flows for one second.It is not a measure of energy because the same charge could need only 2 volts to cause the charge to flow ( as in electrolytic refining of copper) or it might need 100 million volts(as in lightning for instance)