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电路计算题是初中物理电学中的重点,也是同学们在解题中常遇到的难点.这类题的特点:一是常用开关的断开和闭合来改变电路的结构;二是常用滑动变阻器滑片的移动来改变电路的结构;三是电路中电流表、电压表较多影响同学们对电路结构的分析与判断.对于此类题型,若能运用“排除法”画出等效电路,简化电路结构,便很容易求解.
The circuit calculation problem is the key point in the junior middle school physics, and it is also the difficulty encountered by the students in solving the problem. The characteristics of such questions: First, the opening and closing of commonly used switches to change the structure of the circuit; the second is the sliding varistor slide The movement of the chip changes the structure of the circuit. Third, the ammeter and voltmeter in the circuit affect the analysis and judgment of the circuit structure of the students. For these types of questions, the equivalent circuit can be drawn using the “exclusion method” to simplify the circuit. The circuit structure is easy to solve.