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纵观历年各地市的中考试题,由滑动变阻器滑片的移动或电路中开关通断而形成的动态变化电路的电学题涵盖了填空题、选择题、计算题等多种题型,已经成了命题的热点和中考的重要题型.它除了考查学生有关串、并联电路的电流特点、电压特点,欧姆定律,电功率的公式运用外,更强调学生对欧姆定律、电功率的理解,即定律中的I、U、R、P均是同一导体或同一段电路上对应的同一状态下的物理量,而在动态变化电路中,
Throughout the calendar year around the city in the examination questions, by the sliding rheostat vane movement or circuit switch off and formed the dynamic change circuit electrical problem covers blank fill questions, multiple choice questions, calculation questions and other kinds of questions, has become In addition to examining the students about string, parallel circuit current characteristics, voltage characteristics, Ohm’s law, the use of electric power formula, but also to emphasize the student’s understanding of Ohm’s law, electric power, that is, the law I, U, R, P are the same conductor or the same section of the physical state of the same state of the circuit, and dynamic change in the circuit,