  We investigate charged Nambu-Goto strings/membrane systems in the
Einstein-Maxwell theory in 3+1 dimensions. We first construct a charged string
hedgehog solution that has a single horizon and conical singularity. Then we
examine a charged membrane system, and give a simple derivation of its self
energy. We find that the membrane may form an extremal Reissner-Nordstrom black
hole, but its interior is a flat spacetime. Finally by combining the charged
strings and the membrane we construct black hole solutions that have no
singularities inside the horizons. We study them in detail by varying the
magnitude of the two parameters, namely, the charge times the membrane tension
and the string tension. We also argue that the strings have, due to the large
redshift inside the system, a fair amount of degrees of freedom that may
explain the entropy of the corresponding black holes.
