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判断电表示数及灯泡亮度的变化,确定用电器功率的变化范围等问题,是历届中考必选题型,也是同仁争相讨论的热点问题之一.笔者以为,求解这类问题还是函数方法好.用函数方法求解电路中物理量的变化,首先是确定电路的连接方式;其次是判断电表的功能,并根据电流定律和电路特点写出待求物理量的函数式;最后依据电路中自变量(变阻
Judging the changes in the number of electrical representations and the brightness of light bulbs and determining the range of changes in the power consumption of electrical appliances is a must-have item for previous examinations. It is also one of the hot topics that colleagues are eager to discuss. I believe that solving such problems is still a good method. The use of functional methods to solve the changes in the physical quantity of the circuit, the first is to determine the connection of the circuit; second is to determine the function of the meter, and according to the current law and circuit characteristics to write the functional formula of the physical quantity to be sought; Finally, according to the circuit in the variable (change Resistance