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We study the matching of a general spherically symmetric spacetime with aVaidya-Reissner-Nordstrom solution. To that end, we study the properties ofspherically symmetric electromagnetic fields and develop the propergravitational and electromagnetic junction conditions. We prove that genericspacetimes can be matched to a Vaidya-Reissner-Nordstrom solution or one of itsspecializations, and that these matchings have clear physical interpretations.Furthermore, the non-spacelike nature of the matching hypersurface is provedunder very general hypotheses. We obtain the fundamental result that anyspherically symmetric body, be it in evolution or not, has un upper limit forthe total net electric charge that carries.Comment: 33 page

Spherically symmetric models for charged stars and voids: I. Charge bound