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> 某同学说：在用伏安法测量小灯泡电阻的实验中，连接电路时，需要注意以下几点，你认为其中不必要的是 A.向电路中连接开关时，应该先将开关断开 B.开关应该接在靠近电源正极的位置 C.电压表、电流表的量程选择要合适 D.向电路中连接滑动变阻器时，应该先将滑片位于变阻器阻值的最大处

问题：

发布时间：2024-09-12

某同学说：在用伏安法测量小灯泡电阻的实验中，连接电路时，需要注意以下几点，你认为其中不必要的是

A.向电路中连接开关时，应该先将开关断开
B.开关应该接在靠近电源正极的位置
C.电压表、电流表的量程选择要合适
D.向电路中连接滑动变阻器时，应该先将滑片位于变阻器阻值的最大处

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