[問題] 問個有關電流的笨問題
假設輸入為1V
想要得到10mA電流
1.直接接0.1k電阻
2.用此電路http://ppt.cc/j2U7
R選0.1K,流經0.1K電流為10mA
請問這兩種有什麼差別呢?
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