在使用�动变阻器时需要按照一上一下的原则把两个接线柱接入电路．闭合开关前�动变阻器的�片应调到阻值最大处可以保护电路．题目和参考答案 Sketch Coloring Page

在使用�动变阻器时需要按照一上一下的原则把两个接线柱接入电路．闭合开关前�动变阻器的�片应调到阻值最大处可以保护电路．题目和参考答案 Template

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tomski在使用�动变阻器时需要按照一上一下的原则把两个接线柱接入电路．闭合开关前�动变阻器的�片应调到阻值最大处可以保护电路．题目和参考答案 coloring

一轮复习：�动变阻器的选择知乎 sketch template

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在使用�动变阻器时需要按照一上一下的原则把两个接线柱接入电路．闭合开关前�动变阻器的�片应调到阻值最大处可以保护电路． 题目和参考答案 sketch template

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在图a所示的电路中电源电压恒定不变电阻R1为20欧�动变阻器R2上标有“20Ω 2A 字样闭合电键S�动变阻器R2上的�片P移至 sketch template

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如图所示，电源电压恒为18V，定值电阻R1=20Ω，�动变阻器R2标有“40Ω 05A”，电流表A的量程为006A，电压表量程为0 sketch template

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如图6所示电路中当�动变阻器的�动头P�右运动时有 A．电压表示数减小 B．灯L1变亮 C．灯L2变亮 D．灯L3变亮——青夏教育精英家教�—— sketch template

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