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可变电阻器和电位计

电位计由三个端子组成,其中两个是固定的,一个是可变的。电位计的两个固定端子连接到称为轨道的电阻元件的两端,第三个端子连接到滑动雨刮器。沿电阻元件移动的雨刮器改变电位计的电阻。当雨刮器在电阻路径上移动时,电位计的电阻发生变化。
手动改变电阻以控制电流流动的三端电阻器
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