反電動勢(back e.m.f.) ?

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。

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.