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《中学物理教学参考》2007年第6期《理想变压器空载时原线圈电流为零吗》一文(下称“原文”)中,作者根据理想变压器的等效阻抗关系得出了“变压器副线圈断开时,原线圈中电流(即空载电流)为零”的结论.笔者认为这一结论应做进一步的探讨.首先从理论上分析,当副线圈断开时,副线圈中无电流,从而对原线圈无感应,原线圈相当一自感线圈,显然原线圈中电流不可能为零.同时我们还实测了一部手机充电器上的小型变压器,充电器上标示额
In the article “Reference to physics in middle school physics teaching” No.6, 2007, “Is an ideal transformer with zero primary coil current at no load?” (hereinafter referred to as “original item”), the author obtained the relationship of the equivalent impedance of the ideal transformer. When the secondary winding of the transformer is disconnected, the current in the primary coil (ie, no-load current) is zero. The author believes that this conclusion should be further discussed. First of all, from the theoretical analysis, when the secondary coil is disconnected, the secondary coil There is no current in the coil, so there is no induction on the original coil. The original coil is quite a self-inductance coil. Obviously, the current in the original coil cannot be zero. At the same time, we also measured a small transformer on a mobile phone charger.