通常情况下,以电功率为主线的电学综合题的难度仅在于分析电路结构这一层次上.但近年中考出现了一类涉比型电功率问题,由于电流、电压、电阻没有确定的已知值,给求解带来困难.本文说明此类问题还是有规律的,它们有三种主要类型.掌握了它们,就有思路了. Under normal circumstances, the difficulty of the electrical power line with electric power as the main line only lies in the analysis of the circuit structure. However, in recent years, there has been a type of commutation-type electric power problem in the middle school entrance examination. Because the current, voltage, and resistance have no known known value, It is difficult to solve the problem. This article shows that this type of problem is still regular. There are three main types of these problems. When you master them, you have ideas.