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一、电压单位量值的确定方法1.间接方法根据欧姆定律,电压为电流和电阻所确定,因而通常通过电阻和电流的绝对测量即可求得。而电阻的绝对测量起初是用计算电感(自感或互感)与频率通过交流电桥而得到的。到六十年代采用计算电容方法,已使准确度从1×10~(-5)提高到1×10~(-7)。电流的绝对测量通常用电流天平或电动力计。法、美、英、苏、日及东德等国电流天平的测量误差一般为(4～10)×10~(-6),由于其装置复杂且麻烦,
First, the method of determining the magnitude of the voltage unit 1. Indirect method According to Ohm’s law, the voltage is determined by the current and resistance, which is usually obtained through the absolute measurement of resistance and current. The absolute measurement of the resistance is initially calculated by the inductance (inductance or mutual inductance) and the frequency obtained by the AC bridge. To the sixties using the calculation of capacitance method, has made the accuracy from 1 × 10 -5 (-5) to 1 × 10 -7. Absolute measurement of current is usually current balance or electrodynamic meter. The measurement errors of current balances in France, the United States, Britain, the Soviet Union, Japan, East Germany and other countries are usually (4 ~ 10) × 10 -6,