四年级科学下册《导体和绝缘体》实验指导活动探究实验:借助电路
检测
工程第三方检测合同工程防雷检测合同植筋拉拔检测方案传感器技术课后答案检测机构通用要求培训
器来检测物体的导电性。(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)【实验目的】检测物体的导电性。(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)【实验材料】一个电路检测器、回形针、橡皮、钥匙、导线(芯)、木质铅笔、铁钉、粉笔、塑料尺、干树枝、金属纽扣、玻璃片、吸管、长尾夹、透明胶带、铅笔芯、砖块、一元硬币、瓷勺、泡沫块、羽毛。(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)【实验步骤】(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)(1)用两个检测头接触要检测物体的两端,观察小灯泡是否发光。(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)(2)重复检测两次,并将检测时小灯泡“亮”或“不亮”的情况
记录
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下来。(重复检测两次,是为了提高裣测的准确性,减少失误)(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)【试验现象】【实验结论】回形针、钥匙、导线(芯)、铁钉、金属纽扣、长尾夹、一元硬币都是由金属材料制成的物品,这类物品都容易使电流通过。铅笔芯不是由金属材料制成的,但它也可以使电流通过。橡皮、木质铅笔、粉笔、塑料尺等都是由非金属材料制成的物品,这类物品不容易使电流通过。理解与应用1.像铜丝那样容易通过电流的物质,我们称它们为导体。像电线外包着的塑料那样不容易通过电流的物质,我们称它们为绝缘体。2.我们利用导体把电送到人们需要的地方,我们利用绝缘体阻止电流到人(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489830&idx=2&sn=8d35f185f8595ba5a0902a8db0a23b17&chksm=ebe3bf54dc94364294d5b47e17b92dd9f38dd5b1ed46f17cbcea5ba2453757cfdb4c1296972b&scene=21"\l"wechat_redirect"\t"_blank)们不希望有电的地方。精炼反馈1、如图标出了制成铅笔的几种材料,通常条件下属于绝缘体的是( )。(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)A.木材、橡皮(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)B.石墨、金属(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)C.不确定(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)【答案】A(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)【详解】根据对选项进行分析,可知只有A中的木材和橡皮都是绝缘体,不善于导电。所以
题
快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题
目的答案为A。(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)2、将下列各种物体连接在如图所示的电路检测器中,小灯泡不能够发光的是( )。(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)A.铁钉(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)B.回形针(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)C.三角板(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)【答案】C(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)【详解】根据对题意分析,可知用选项中的物体连接电路时,只有导体才能使小灯泡亮起来。分析选项,只有C选项的三角板是绝緣体,所以正确答案是C。(http://mp.weixin.qq.com/s?__biz=MzI4NjA0NDk1Nw==&mid=2247489031&idx=1&sn=5fab1bb7a32246385cd16171b0ef5073&chksm=ebe3b075dc94396395a58721cf9f64e01251a7b12c3440c7753f5707ab4fc4621cc2569f09aa&scene=21"\l"wechat_redirect"\t"_blank)2