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电学是初中物理的重要知识,由于和生产、生活联系紧密,因而在中考中占有相当大的比例,历年来都是中考的重点和热点。把握好这部分知识,明确其考点、命题趋势和试题呈现形式,对学生的复习备考具有重要作用。下面结合考题对中考电学考点作一分析,供广大同人参考。考点一、串并联电路的电流特点电阻串联电路的总电流等于流过各电阻的电流。电阻并联电路的总电流等于流过各电阻的分电流之和。例1根据如图1所示的用电流表测电流的实验,
Electricity is an important knowledge of physics in junior high school. Due to its close connection with production and life, electricity accounts for a considerable proportion of senior high school entrance examinations. Over the years, it has been the focus and hot spot for senior high school entrance examination. Grasp this part of the knowledge, a clear test sites, proposition trends and test questions presented in the form of review preparation for students plays an important role. The following examination questions on the test center for an analysis of electricity for the majority of colleagues reference. A test site, the current characteristics of the series-parallel circuit Resistor series circuit total current equal to the current flowing through the resistors. The total current in the parallel circuit of resistance is equal to the sum of the sub-currents flowing through each resistor. Example 1 According to the current meter as shown in Figure 1,