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更新时间:2026.06.14
把Rx=√(RV·RA)作为判断电阻大小的依据是什么

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1关于伏安法测电阻的教学片段 使用伏安法测电阻时,由于电表内阻的影响,测量值存在系统误差。使用电流表内接法(如图1所示)测量电阻时,测量值与真实值的关系如下:U测=UR+UA,I测=IR=IA。

开关和保险丝

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开关和保险丝 An electric switch is often on a wall near the door of a room. Two wires lead to the lamp in the room. The switch is fixed in one of them. The switch can cause a break in this wire, and then the light goes. The switch can also join the two parts of the wire again, then we get a light. Switch can control many different things. Small switches control lamps and radio sets because th

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