电路教学中,复杂直流电路的分析既是重点,又是难点。对于b条支路、n个节点的电路,用支路电流法需要列写b个方程,由于方程维数较高,因此求解不方便。节点电压法以节点电压为待求量列写方程,它所涉及的变量少、方程数少,是分析、求解电路的较方便和快捷的方法,因而被广泛采用。 Circuit teaching, the analysis of complex DC circuit is not only the focus, but also difficult. For the b branch, n nodes of the circuit, the branch current method needs to write b equations, the higher the dimension of the equation, so inconvenient to solve. The node voltage method uses the node voltage as the desired quantity to write the equations. It involves less variables and less equations, and is a convenient and quick method to analyze and solve the circuit. Therefore, it is widely used.