惠斯通电桥如何调节电桥平衡 惠斯通电桥，当电桥平衡时，为什么电流计示数为0？请详细解答
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调节其中一个桥臂可调电阻 测电流 电流为零 电桥处于平衡状态 （除了加电端 另外两点 连接电流表）
从电势点这个角度来做。
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