在物理电学试题中,常会有些关于电路元件取值范围的求解问题,由于这类题中有一些隐含条件的制约,而且数学运用能力较强,学生在求解时常常出错。在解这类题时,若能正确分析电路,理清电流、电压和平共处电阻之间的关系,并选取适当的制约条件,定能准确求解。提高解题的速度和正确率。 In the physical electrical test questions, there are often questions about the solution of the range of circuit components. Because there are some implied conditions in such questions and the ability to use mathematics is strong, students often make mistakes in solving. In solving such questions, if the circuit can be properly analyzed, and the relationship between current and voltage and the coexistence of resistance can be clarified, and appropriate constraints are selected, it can be accurately solved. Improve the speed and accuracy of problem solving.