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大家知道 ,滑动变阻器连接在电路中的作用之一是保护电路 ,只要滑动变阻器的阻值在一定范围内 ,电路中的电表、用电器等元件就不会超过量程或损坏 .所以 ,在初中物理电学中常遇到求实际电路中滑动变阻器的取值范围的问题 ,那么如何求解这类问题呢 ?下面举例分析 .图 1例 1 如
As we all know, one of the functions of the sliding rheostat connected in the circuit is to protect the circuit. As long as the resistance of the sliding rheostat is within a certain range, the meter, the electrical device and other components in the circuit will not exceed the range or damage. Therefore, in the junior middle school physics The problem of finding the range of the sliding rheostat in the actual circuit is often encountered in electricity. How to solve this kind of problem? The following example is analyzed. Figure 1 Example 1