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在每年各地的中考试题中,考查同学们能力实验设计的问题越来越多,这有利于考查我们的综合实验能力和创新能力,等效替代法常常成为解答此类试题的桥梁和纽带,有利于问题的顺利解决.下面举例说等效替代法在解答有关电学实验设计题中的妙用.一、电阻等效替代例1利用如图1所示的电路,测定一个电热器R0(R0的阻值未知,额定电压已知为U0)的额定功率P0,图中R为滑动变阻器,R’为电阻箱,图中所有仪器
Among the mid-term exam questions throughout the year, examining students’ ability to experiment and design more and more problems is conducive to examining our comprehensive experimental ability and innovative ability. The equivalent substitute method often serves as a bridge and link to answer such questions. There are Conducive to the smooth solution to the problem. The following is an example of the equivalent alternative method to solve the magical effect of the electrical experiment design questions. First, the equivalent resistance alternative 1 using the circuit shown in Figure 1, determine an electric heater R0 (R0 resistance The value is unknown, the rated voltage is known as U0) rated power P0, the figure R is a sliding rheostat, R ’for the resistance box, all the instruments in the figure