Is it possible to generate a purely positive charge and/or a purely negative charge with power supplied mechanically? (Or electric power)
If so, what would be the relation between the power input and the charge generated? (I'm guessing that it might depend on the mechanism used, but a rough idea is all I need.) Then what would be the relation between the power input and the current given off the generator to a source of opposite (equal) charge?
Any help would be great. Web sites dealing with this would also be helpful. Thank you.