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滑动变阻器是初中物理电学中一个非常重要的电学元件,因为它的阻值可以变化,所以电路中电压、电流变活了.结合电路中不同位置开关的作用,电路变化多端,更活泼,也更神秘.滑动变阻器可以改变电路中电流,调节用电器两端的电压,更多的是为了保护电路,有时是为了保护用电器,有时是为了保护电表.滑动变阻器的阻值变化范围常常作为电学的压轴题,很多同学会觉得无处下手,其实细细研究,还是有法可依的.
The sliding rheostat is a very important electrical component in the junior high school physics electricity, because its resistance value can be changed, so the voltage, electric current in the circuit has become alive. Combine the function of the switch in different positions in the circuit, the circuit changes many, more lively, also more Mysterious. Sliding varistors can change the current in the circuit, regulate the voltage across the consumer, more to protect the circuit, sometimes to protect the appliance, and sometimes to protect the meter. The sliding resistance range of the varistor is often used as the final axis of electricity. Question, many classmates will feel nowhere to start, in fact, careful study, there are laws to follow.