Abstract: The reason of difference between theoretical attenuation coefficient and experimental one is analyzed. The damped oscillation wave is expressed to harmonics in the Fourier series, the loss resistance of inductor and capacitor are measured when the first harmonic and the harmonics which replacing the damped oscillation wave are applied to the RLC series circuit. The theoretical value of attenuation coefficient is amended,so as to the agreement between the amended theoretical value of attenuation coefficient and the experimental one can be obtained.

Key words: transient process, damped oscillation, attenuation coefficient, harmonic analysis, loss resistance