I want to make an electrical coal which has the ability of being charged for some hours or use the power directly.
What is it made of? and how can I build it?
What is your suggestions?
A rechargeable battery is the first thing that comes to mind.
Or are you thinking of a capacitor, or supercapacitor?
A capacitor will not necessarily keep a charge for hours.
Supercapacitors function in a manner somewhere between batteries and capacitors. Supercapacitors are related to coal in the sense that you can make them from carbon-type materials.
Yes I mean "electric fire".
In fact I want to know that what is an electrical coal, which use for hubble bubble, made of?
I am searching for it's structure.