  The electromagnetic form factors of the nucleon have been calculated in a
chiral constituent-quark model. The nucleon wave functions are obtained by
solving a Schr\"odinger-type equation for a semi-relativistic Hamiltonian with
an effective interaction derived from the exchange of mesons belonging to the
pseudoscalar octet and singlet and a linear confinement potential. The
charge-density current operator has been constructed consistently with the
model Hamiltonian in order to preserve gauge invariance and to satisfy the
continuity equation.
