惠斯通电桥电路中耗散功率的极值问题

Extremum Problem in the Wheatstone Bridge Circuit

依据最小作用量原理分析了惠斯通电桥电路,用Lagrange乘数法证明了惠斯通电桥电路中电流的实际分布必使电路的耗散功率取极小值。

Based on the Least-action principle,Wheatstone bridge circuit is analysed. By using the Lagrangian multiplier method, it proves that the voltaic actual distributing makes its dissipation power reach its minimum.