为什么开路时相当电阻无限大?电压=220V,根据公式R=U/I,得到R=200除已0,则R等0,怎么说无限大呢?在万能表中怎么能看出来电阻无限大(小),和电流无限大(小),不懂的请勿回复
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![为什么开路时相当电阻无限大?电压=220V,根据公式R=U/I,得到R=200除已0,则R等0,怎么说无限大呢?在万能表中怎么能看出来电阻无限大(小),和电流无限大(小),不懂的请勿回复](/uploads/image/z/8303015-47-5.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%88%E5%BC%80%E8%B7%AF%E6%97%B6%E7%9B%B8%E5%BD%93%E7%94%B5%E9%98%BB%E6%97%A0%E9%99%90%E5%A4%A7%3F%E7%94%B5%E5%8E%8B%3D220V%2C%E6%A0%B9%E6%8D%AE%E5%85%AC%E5%BC%8FR%3DU%2FI%2C%E5%BE%97%E5%88%B0R%3D200%E9%99%A4%E5%B7%B20%2C%E5%88%99R%E7%AD%890%2C%E6%80%8E%E4%B9%88%E8%AF%B4%E6%97%A0%E9%99%90%E5%A4%A7%E5%91%A2%3F%E5%9C%A8%E4%B8%87%E8%83%BD%E8%A1%A8%E4%B8%AD%E6%80%8E%E4%B9%88%E8%83%BD%E7%9C%8B%E5%87%BA%E6%9D%A5%E7%94%B5%E9%98%BB%E6%97%A0%E9%99%90%E5%A4%A7%EF%BC%88%E5%B0%8F%EF%BC%89%2C%E5%92%8C%E7%94%B5%E6%B5%81%E6%97%A0%E9%99%90%E5%A4%A7%EF%BC%88%E5%B0%8F%EF%BC%89%2C%E4%B8%8D%E6%87%82%E7%9A%84%E8%AF%B7%E5%8B%BF%E5%9B%9E%E5%A4%8D)
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