The use of HTSC tapes as main components in future power applications requires better understanding of their AC loss behaviour. Previous studies have lead to conclusions that eddy current loss is a significant loss factor at high frequency in self-field. In this paper we present a Finite Elements Method electromagnetic simulation of the current density and magnetic field distribution in the tape for 59Hz and 1kHz. The Ac losses due to eddy currents in the silver sheath are calculated for a mono and multicore tape. To carry out the electromagnetic simulation we have characterized the electric and magnetic properties of the superconductor using a simple model of a Bi2223 tape.