the proton a charge of 
Some others carry none, e.g. the neutron is uncharged. [P3.3]
is: a fundamental property of matter which determines whether or not particles or bodies experience electrical interactions. [P3.3]
is classified: into two types: positive and negative. Charges of the same type repel each other, charges of opposite types attract each other. [P3.3]
is carried: by some fundamental particles, e.g. the electron carries a charge of the proton a charge of Some others carry none, e.g. the neutron is uncharged. [P3.3]
has as its SI unit: the coulomb (C), where 
(i.e. 1 ampere second).
Copyright 1997, The Open University