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中学物理课本上感应电动势的计算公式有两个.分别是E=ΔΦ/Δt和E=BLV.学生对这两个公式大都局限于表象的记忆,Δt应用中易出现这样或那样的错误,为避免或减少出错,应深刻理解这两个公式之间的实质关系.一、普遍规律和特殊形式的关系法拉第电磁感应定律是电磁感应的最基本的规律,“电路中的感应电动势的大小,跟穿过这一回路的磁通量变化率成正比.”数学表达式为E=ΔΦ/Δt,适用于任何条件下,对感应电动势
There are two formulas to calculate the induced electromotive force in high school physics textbooks: E = ΔΦ / Δt and E = BLV. Students confine these two formulas mostly to the memory of appearances. One or more errors in Δt applications are To avoid or reduce errors, should be a deep understanding of the substantive relationship between the two formulas.A general law and the relationship between the special form Faraday’s law of electromagnetic induction is the most basic law of electromagnetic induction, “the size of the induced electromotive force in the circuit, Is proportional to the rate of change of the magnetic flux passing through this circuit. ”The mathematical expression is E = ΔΦ / Δt and applies to any condition where the induced electromotive force