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电学黑箱问题往往给出了电路中的电学现象,但因黑箱的种类变化多端解无定法,所以在分析黑箱问题时一般先判断箱内电阻的连接方式:若所测电压发生变化,则电阻通常为串联;若所测电流发生变化,则电阻可能并联,也可能是电阻原来串联后来其中一只电阻被短路(但电路中应有另一只开关).电阻连接方式确定后,再由题中条件确定电阻的位置和数值.下面举例分析.
Electrical black box problem often gives the electrical phenomenon in the circuit, but because of the variety of black box solution, there is no fixed method, so when analyzing the black box problem, it is usually first to determine the connection mode of the resistor inside the box: if the measured voltage changes, the resistance is usually For series connection; if the measured current changes, the resistance may be connected in parallel, or the resistance may be connected in series and one of the resistors may be short-circuited (but the circuit shall have another switch). After the resistance connection method is determined, The conditions determine the position and value of the resistor. The following example analysis.