什麼東西在通電後會膨脹

任何金屬通電後就會發熱, 然後膨脹, 碳精carbon除外。

女人和男人通電後肚子隨時會澎漲。

There is heat produced after an electric current is made to pass through a substance. Most substances expand on heating.

Therefore, from the physics point of view, most common substances will expand on passing an electric current.

有，手機電池，尤其係山寨機。