Re: stupid question?????!!!!
Most People like me can only see the behaviour of charge (1 unit of charge =electron).
[Empirical] There is two types of feasable behaviour between any charge:
repulsion or attraction.
Repulsion and atraction were studied [empirical] to give the Coloumb Law.
Negative/Positive charge are at this moment useful representations to explain repulsion or attraction.
There are many effects with great evidences [empirical] static charge, charge transference:
Mechanical: piezoelectricity- an strength applied to a specific material organize the charge, to presents local deffects of charge, breaking the neutrality.
Chemical: battery- two materials by contact may suffer spontaneous redox reaction, then there is lost of electrons to one of the materials. This effect was utilized to make a battery, like in other sciences discovered in a odd situation by Volta.
Electric: when we approach our arm (with some hair) to a monitor television (with some dust) we see a small lightning.
Photoelectric: if the radiation that interacts with charge (valence band) have sufficient energy, then is capable of pull-up the negative charge to outside action of nucleous.
We can see many practical evidences of existence of charge, at different situations.
At microscopic level, the knowledge there isn't so popular.