电学计算题一般都以“电源电压不变”作为列方程的依据.但是,当电源电压发生变化时,如何寻找解题思路呢?可以这样: 1.以同一用电器在不同电压下的功率关系为线索例1 一个阻值为12Ω的小灯泡和定值电阻R并联 Electrical calculation questions are generally based on the “power supply voltage constant” as the basis of the equations. However, when the supply voltage changes, how to find a solution to the problem? It can be: 1. The same power consumption in different voltage power relations As a lead example, a small light bulb with a resistance of 12Ω is connected in parallel with a set resistor R.