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一、命题规律电磁感应电路问题为每年高考的热点,考查方式既有选择题,也有计算题,主要涉及电流、电压、电功率、电热和电量的计算.二、解决电磁感应中电路问题的思路1.“源”的分析:用法拉第电磁感应定律算出E的大小,用楞次定律或右手定则确定感应电动势的方向,感应电流方向是电源内部电流的方向,从而确定电源正负极,明确内阻r.2.“路”的分析:根据“等效电源”和电路中其他各元件的连接方式画出等效电路.
First, the law of proposition Electromagnetic induction circuit for the hot entrance exam each year, there are multiple-choice test questions, there are calculation problems, mainly related to the current, voltage, electric power, electric heat and electricity calculations. Second, to solve the problem of electromagnetic induction circuit ideas 1 . “Source ” analysis: using Faraday’s law of electromagnetic induction to calculate the size of E, using Lenz’s law or right hand rule to determine the direction of the induced electromotive force, the direction of the induced current is the direction of the internal current power supply to determine the positive and negative power supply, Clear internal resistance r.2. “Road ” analysis: According to “equivalent power ” and the circuit of the other components connected to draw the equivalent circuit.