It’s examined operation of coreless electrical coil in case of shortening of coil’s one turn. On base of equations for coreless coil an expressions for calculation of resistance and inductance of shortened coil in respect to circuit of supply source with not shortened part of coil is obtained. Ones show dependence of the parameters on frequency and number of turns of not shortened part of coil, as also on time constant of the turn. It’s shown that at shortening a resistance of not shortened part is fast growing but inductance – decreasing in large extent especially at bigger values of time constant for the turn. At this if frequency is higher than reaction is stronger. As result at higher frequency current of source at shortening rises stronger as at lower one. Comparison of obtained calculation equations with results of computer modeling is done and it shows good concordance. Because mutual insulation of turns should be examined in the high frequency circuit in resonance oscillation case, it is realized investigation of such regime at shortening of one turn. As show results because of rising of resistance and lowering of inductance of not shortened part of coil after shortening oscillation process is practically braked and current in supply circuit is close to the zero level. But in the last case effect depends on time constant of shortened turn – if this indicator is smaller than braking of resonant oscillations will be stronger at bigger frequency.