如果一個高速轉動中的風扇
被我一手禁住扇葉禁停左(假設我無受傷)
1.咁係電路會唔會有反電動勢(back e.m.f.) ?
2.如果風扇係連接拖板,咁連接拖板GA其他電器GAIN到電壓會唔會改變?
反電動勢(back e.m.f.) ?
2010-03-10 6:34 am
回答 (2)
2010-03-10 7:05 pm
✔ 最佳答案
如果一個高速轉動中的風扇，被我一手禁住扇葉禁停左(假設我無受傷)如果你那樣做，back emf 便沒有了。沒有back emf，電流將大增，很可能燒掉風扇。你最好預備滅火筒。
祝平安。
2010-03-10 7:46 am
1.咁係電路會唔會有反電動勢(back e.m.f.) ?
Back emf is induced in the coil of a motor when the coil is in rotation. Hence, if the rotating coil was stopped by force, there would not be any back emf.
2.如果風扇係連接拖板,咁連接拖板GA其他電器GAIN到電壓會唔會改變?
Appliances connected to a power board are connected in parallel. There would not be any voltage change to other appliances.
Back emf is induced in the coil of a motor when the coil is in rotation. Hence, if the rotating coil was stopped by force, there would not be any back emf.
2.如果風扇係連接拖板,咁連接拖板GA其他電器GAIN到電壓會唔會改變?
Appliances connected to a power board are connected in parallel. There would not be any voltage change to other appliances.
收錄日期: 2021-04-29 17:35:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100309000051KK01487