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现行高中物理课本第四册,感抗、容抗一节中,关于感抗、容抗与交流电频率的关系,教材没有提出具体实验的办法,因此不易为学生所接受。针对这种情况,我们制作了两件简单教具,解决这个问题,收到了较好的效果。(一)感抗与交流电频率关系的实验如图1示,在电路中串入一个金属齿轮、钢片(弹性要好)构成的断续器,当齿轮旋转时,电路中出现断续电流,旋转愈快,可明显观察到灯泡愈暗,这就充分说明电路中通过电
With regard to the relationship between inductive reactance, capacitive reactance, and frequency of alternating current, the textbook of the current senior high school physics textbook No.4, Induction, capacitance and resistance, does not propose specific experimental methods. Therefore, it is not easy for students to accept it. In response to this situation, we produced two simple teaching aids to solve this problem and received good results. (a) The experiment of the relationship between inductive reactance and alternating current frequency is shown in Fig. 1. In the circuit, a metal gear, steel sheet (elasticity is better) constitutes the interrupter. When the gear rotates, intermittent current flows in the circuit and rotates. The faster, the darker the bulb can be clearly observed. This fully indicates that electricity is passing through the circuit.