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This paper concerns the design of three different electrochemical generators of nonsteady current: two generate a pulsating direct current, the third generates an irregular alternating current. The (Fe|NaBrO3(aq.)+H2SO4(aq.)|Pt) generator induces an alternating current in a secondary circuit connected to a transformer. The influence of electrode size and external resistance on current oscillation parameters and on power is shown. The shape of current oscillation in the generators (Fe|NaBrO3(aq.)+H2SO4(aq.)|Pt), (Zn/ZnSO4(aq.)||NaBrO3(aq.)+H2SO4(aq.)|Fe) and (Fe|NaBrO3(aq.) +H2SO4(aq.)|Fe) are also shown and the working of the three generators is explained.