同学们,新的学期开始了,经过一个假期的休息,相信同学们有了更加旺盛的精力。回顾上学期电学的学习,有关滑动变阻器的应用的学习,大多数的同学还是记忆犹新的。有关滑动变阻器的滑片移动时,电流表、电压表示数变化情况的判断,是历年中考物理试题热点。由于这类题型用到欧姆定律及串、并联电路的特点等知识,涉及到的知识点多,题目较灵活,还要求学生有一定的综合能力,难度较大。今天我就 Students, the new semester began, after a holiday break, I believe students have a more exuberant energy. Review the last semester of electrical learning, the application of sliding rheostat learning, most students still remember. Sliding rheostat sliding on the move, ammeter, voltage changes that the number of judgments, is the calendar year physics test hot topic. Because such questions use Ohm’s law and string, parallel circuit characteristics and other knowledge, involving more knowledge, more flexible topic, but also requires students to have a certain degree of comprehensive ability, more difficult. Today I am