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滑动变阻器的哪一段电阻丝接入电路，常给学生初学造成困惑，教师不得不花大量精力去解决这一难点。如果教师在演示实验中能针对这一难点改进演示方法和改进仪器结构，就可以做到省时省力。1改进演示方法在体积较大的50Ω1．5A滑动变阻器的电阻体下部事先熔化一定量的石蜡，粘?
Which section of the sliding rheostat is connected to the resistor wire often causes confusion for the students to begin learning. Teachers have to spend a lot of effort to solve this difficulty. If the teacher can improve the demonstration method and improve the instrument structure in this demonstration experiment, this can save time and effort. 1Improvement of the demonstration method A certain amount of paraffin was previously melted in the lower part of the resistor body of a large 50Ω 1.5A sliding rheostat.