電磁石
電攝石，攝石一種，不過要綫圈通電先會攝，一無電就唔攝，並非永久攝石。佢亦叫電磁鐵、電磁石。電流流過綫圈，就出磁場，磁場會集中喺綫圈中間流過，鐵芯之類會再集中佢，化成攝石而且攝好勁。電流愈大，就磁場愈強，攝石就會愈勁。
一八二〇年發現電流生磁場。一八二四年就發明電攝石[2][3]。
現今大把電器電子儀器都要用電攝石，摩打、發電機、繼電器、電喇叭、硬碟、磁力共振造影機等等都要用。工業收集廢鐵，好重好大件，要吊要移，都靠電攝石[4]。
參考資料
[編輯]- ↑ 1.0 1.1 Nave, Carl R. (2012). "Electromagnet". Hyperphysics. Dept. of Physics and Astronomy, Georgia State Univ. 原先內容歸檔喺September 22, 2014. 喺September 17, 2014搵到.
- ↑ Sturgeon, W. (1825). "Improved Electro Magnetic Apparatus". Trans. Royal Society of Arts, Manufactures, & Commerce. 43: 37–52. cited in Miller, T.J.E (2001). Electronic Control of Switched Reluctance Machines. Newnes. p. 7. ISBN 978-0-7506-5073-1. 原先內容歸檔喺2016-12-03.
- ↑ Windelspecht, Michael. Groundbreaking Scientific Experiments, Inventions, and Discoveries of the 19th Century 互聯網檔案館嘅歸檔，歸檔日期2017-01-11., xxii, Greenwood Publishing Group, 2003, ISBN 0-313-31969-3.
- ↑ Merzouki, Rochdi; Samantaray, Arun Kumar; Pathak, Pushparaj Mani (2012). Intelligent Mechatronic Systems: Modeling, Control and Diagnosis. Springer Science & Business Media. pp. 403–405. ISBN 978-1447146285. 原先內容歸檔喺2016-12-03.