其實電流有冇顏色

電流其實係睇唔到既，所以好危險，邊有顔色喔。
電線既顏色只不過係電線記號顏色方便認

2008-03-29 22:45:37 補充：
高壓電被激活時會放電，係藍色既，如電單車既火花塞 Spark Plug 既火花係藍色既。

Electricity is the flow of charge around conductors, you can think of it as moving electrons, so, why would the flow of something have colour?
The colour you see when heating metals and stuff with electricity is because the acceleration of the electrons within the material, allowing them to jump to higher quantum (energy) states, and they will go back to their original states by emitting light (photons) of different colours (wavelenth).

囧!其實電流係一種能量
電流冇顏色,但因為佢既極大能量
燃燒左空氣,所以有色
雖然好似火,但電重比火強好多架