0人已收藏
0人已打赏
免费0人已点赞
分享
继电保护
返回版块7.33 万条内容 · 452 人订阅
阅读下一篇
各位前辈,我问一个关于保险丝的问题(英文)Calculate the time it would take to melt a steel nail (4A current fuse). The nail may be assumed to be a perfect cylinder with a diameter of 2.5mm and a length of 2cm. It should also be assumed that resistance has a linear relationship to temperature and there are no energy losses. The room temperature is 20℃. The nail has the following properties: Specific Heat Capacity 420 Jkg^-1K^-1, Density 8000kg/m^3, Resistivity 7*10^-7Ωm, Melting Point 1370℃
回帖成功
经验值 +10
全部回复(2 )
只看楼主 我来说两句抢地板回复 举报
回复 举报