V-I characteristics of breaking arcs between electric contacts are investigated at several contact materials (Au, Ag, Cu, Pt, Ni). The time variations of arc voltage, arc current and gap length are measured, simultaneously. V-I characteristics and minimum arc voltages were obtained from those measured values. The result shows that minimum arc voltages for each contact material agreed with those values by Holm. The V-I characteristics at several contact materials (Au, Ag, Cu, Pt) except Ni electric contacts almost agreed with Holm's V-I characteristics. The difference for V-I characteristics between Ni electric contacts and the others is because of the low electric field of the arc column for nickel electric contacts.
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