Computer loads can be found in all of modem society. The switching mode power supplies used in personal computers are major sources of harmonic currents. Harmonic currents can cause lots of harmonic problems such as voltage waveform distortion, excessive neutral currents, errors in measurements, and disruption in computer performance. The purpose of this paper is to give an equivalent circuit modeling methodology for the harmonic currents generated by single-phase personal computer loads and to evaluate a commercially available series resonant filter for the harmonic currents compensation based on the IEEE 519-1992 and IEC1000-3-2 standards for limiting harmonic distortion.