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[命题方向]电学是初中物理的重点内容之一,电路识别与电路故障分析又是这一部分的典型习题,电路识别主要是通过开关的通断、滑动变阻器的滑片滑动来改变电路结构,形成动态电路;电路故障分析主要是断路和短路两种情况。
[Proposition direction] Electricity is one of the key contents of junior high school physics. Circuit identification and circuit failure analysis are typical exercises in this part. The circuit identification is mainly through the switch on and off, sliding varistor slider sliding to change the circuit structure, forming Dynamic circuit; Circuit failure analysis is mainly the situation of open circuit and short circuit.