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为使学生对“相位”和“相位差”有一形象的认识,可增加如下的演示实验。用两台教学用的大型电流计,一台串联500Ω左右分压电阻做电压表用,一台并联10Ω左右分流电阻做电流表用。(这样改装能使两表指针摆动幅度大体一致,便于观察)然后,准备三个基本元件:100Ω电阻、2000μF电容器(电解电容)和一支电感线圈(可用500w自耦变压器初级线圈代替)。再用一个阻值为100Ω的线绕电位器或滑线变阻器,在其中点处引出一段导线,与滑动端引线共同傲为交洫电的输出端(也可直接采用“二极管
In order to make students have an image of “phase” and “phase difference”, the following demonstration experiment can be added. With two large current meters for teaching, a series voltage divider with a voltage of about 500Ω is used as a voltmeter, and a shunt resistance of about 10Ω is used in parallel as an ammeter. (This modification can make the amplitude of the two pointers approximately uniform for easy observation.) Then, three basic components are prepared: a 100Ω resistor, a 2000μF capacitor (electrolytic capacitor), and an inductor coil (a 500W autotransformer primary coil can be used instead). Then use a wire-wound potentiometer or sled varistor with a resistance of 100 Ω to lead a piece of wire at the midpoint and use it as the output end of the slew end wire.