A four-arm perfect electrical bridge relates to electrical engineering and can be used at measurements of physical values, in devices and measuring-computing control complexes and in information-measuring systems in different branches of economy and in scientific investigations. The electric bridge comprises six electro-conductive branches and a power supply source. All the six resistors of those branches are assembled as a star and triangles and connected to each other with four nodes with formation of arms of the bridge, and the six resistors of the bridge are connected to each other with respective proportion of resistances. A power supply source is placed with possibility of its connection to any branch of the bridge electric circuit with retention of bridge conditions and with possibility of control of its sensitivity. The electrical bridge claimed has high sensitivity, this increases quality of measurements.
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