Current is the rate of flow of charge (Q = I / t) where the charge is given by any charged particle ie. electrons and ions.
The charge on an electron (e) is 1.6x10^-19 C and is equivalent to -1 in relative charge, the net charge of a particle is written as Q = +/- ne where n is the relative charge.
Current is formed when charged particles move when a potential difference is introduced, negatively charged particles move from a -ve to +ve potential, while positively charged particles move from +ve to -ve, in conventional current, current always flows +ve to -ve regardless of the charge on the particles.
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