中四的我突然想到，卻想吾到答案
交流電和直流電的分別?
有沒人解釋到

if your talking about AC and DC, then AC is when the current changes direction frequently, i.e going to the left then going to the right. Dc is only current i.e electrons flowing in only one direction. the advantage of AC is that there is much less energy lost when the electrons travel through a large electrical wire(over a few km) so our wall power points are AC.

D.C係唔會轉方向的，而A.C.就每秒50Hz正負方向轉動，d.c通常跟換向器{half-ring}而a.c.就匯電環

都係答吾到電其實係咩來
電 不等於  電磁波...
一時忘記了係光先對

電子的流動
轉動 cut 左 E-field  便會出現PE

Energy

電 may refer to anything about charge and E-field.

If you are talking about electric current, it depends.
Ordinary speaking, it's moving electric charges. But usually it refers to moving electrons.

If you are talking about electric charge, I can't tell.
And I don't think anyone can tell what charge actually is.