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一、照明类1:手电筒例1在生活中会遇到这样的事:电筒里的电池用旧了,舍不得扔掉,便装一节新电池配一节旧电池继续使用,测量可以发现新旧电池的电动势确实相差不大,而新旧电池的内阻相差较大,设数据如下:新电池E1=1.5V,r1=1.0Ω,旧电池E2=1.5V,r2=5.0Ω(实际可能更大),手电筒的灯泡为“3V、
First, lighting class 1: flashlight Example 1 in life will encounter such a thing: the battery in the flashlight is old, reluctant to throw away, then install a new battery with an old battery to continue to use, the measurement can find the old and new batteries The electromotive force does not differ much, but the internal resistance of the old and new batteries is quite different. The data is as follows: new battery E1=1.5V, r1=1.0Ω, old battery E2=1.5V, r2=5.0Ω (actually greater) The flashlight bulb is "3V,