  The problem of constructing a model of an extended charged particle within
the context of general relativity has a long and distinguished history. The
distinctive feature of these models is that, in some way or another, they
require the presence of negative mass in order to maintain stability against
Coulomb's repulsion. Typically, the particle contains a core of $negative$ mass
surrounded by a positive-mass outer layer, which emerges from the
Reissner-Nordstr\"{o}m field.
  In this work we show how the Einstein-Maxwell field equations can be used to
construct an extended model where the mass is positive everywhere. This
requires the principal pressures to be unequal inside the particle. The model
is obtained by setting the "effective" matter density, rather than the rest
matter density, equal to zero. The Schwarzschild mass of the particle arises
from the electrical and gravitational field (Weyl tensor) energy. The model
satisfies the energy conditions of Hawking and Ellis. A particular solution
that illustrates the results is presented.
