初中物理电学综合题考查串、并联电路的识别，电流、电压、电功率等知识的掌握和灵活运用能力，知识面广，难度大，有时利用分步求解很困难或根本无法求解，必须列方程或方程组，才能化繁为简，化难为易，达到事半功倍的效果．下面以一道题为例谈如何列方程组解电学综合题．一? The junior high school physics electricity comprehensive question examines the string, the parallel circuit recognition, the electric current, the voltage, the electric power and so on the knowledge grasps and the nimble utilization ability, the knowledge is wide, the difficulty is great, sometimes uses the step by step solution to be very difficult or not to be solved at all, must list the equation or The system of equations can be simplified and simplified. It is difficult to change the system and achieve a multiplier effect. The following is an example of how to solve the problem of how to solve the problem of solving equations. one?