四年级科学下册1电5导体与绝缘体课件4教科版.ppt

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导体与绝缘体,电路检测器,检测橡皮的导电性,检测物体导电性时要注意哪些问题?,温馨提醒: 1.检测时先要检测电路检测器是否正常。 2.在检测前先进行预测。 3.为了提高检测的准确性,要重复检测多次。 4.要认真及时地记录检测结果,合理得分析后说说自己的发现。,我们的检测记录 第( )小组,实验数据整理:,1.我们小组共检测了( )种材料。 2.检测中能使小灯泡发光的材料有( )种。 3.检测中不能使小灯泡发光的材料有( )种。 4.我们小组预测正确的材料有( )种,这些材料是( ). 5.我们小组预测错误的材料有( )种,这些材料是( ).,容易导电的物体称为不容易导电的物体称为,导体,绝缘体,当心触电的标志,我知道:,1.用电路检测器检测橡皮是否导电时,要先把电路检测器的两个检测头接触一下,观察灯泡是否发光。.( ) 2.金属材料一般都是导体。( ) 3.我们利用绝缘体阻止电流到人们不需要的地方,因此我们要好好的保护这些绝缘体。.( ) 4.电线外面用塑料包裹,是因为塑料是绝缘体。( ) 5.不要用湿布擦拭电器、插座和开关,也不能用湿手触摸它们。( ),我还知道:,1.所有的金属都是导体( ) 2.无论什么条件下,玻璃都是绝缘体( ) 3.天空正下着雨,一根裸露的电线掉在路中间,小明随手从地上拿起一根木棒,想挑开电线。他这种做法对吗? ( ),

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