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例1 如图所示, 滑动变阻器的最大阻值为R,当滑片由a向 b移动的过程中,MN 两点间的阻值最大为多少? 解析滑片在a 端或b端时,变阻器连入电路中的电阻为零。滑片在a-b之间时:M,N两点间的电阻
Example 1 As shown in the figure, the maximum resistance of the sliding rheostat is R. What is the maximum resistance between the MN points when the sliding block moves from a to b? When parsing the slide at the a-end or b-end, The varistor is connected to the circuit with zero resistance. When the slide is between a-b: resistance between M and N