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纵观近年各地中考物理试题,电路中仪表改装的计算问题备受命题者的青睐。通过把电压表、电流表改装成风力表、油量表等,综合考查欧姆定律、电功率、串并联的相关知识,涉及压力、压强的计算、电路的设计等。此类试题涉及的知识点较多,能较全面地考查学生运用物理知识,解答实际问题的能力,同时也体现了从“生活走向物理,从物理走向社会”这一理念,属于难度较大的一类考题。一、电流表改装成油量表例1(2013·孝感)如图1甲所示为某型号汽车的
Throughout the recent physical examination in various parts of the test questions, the calculation of the circuit instrument modification has been favored by the proponents. Through the voltmeter, ammeter converted into wind table, fuel gauges, etc., a comprehensive examination of Ohm’s law, electric power, serial-parallel knowledge, involving pressure, pressure calculation, circuit design. Such questions involve more knowledge points, which can comprehensively examine students’ abilities of using physical knowledge and answering practical problems. At the same time, they also embody the concept of “moving from physical to physical and from physical to social”, which is more difficult A large class of exam questions. First, the ammeter converted into a fuel gauge Example 1 (2013 · Xiaogan) Figure 1 A shows a model of the car