I have a good idea on this game: create a new "characteristic" (like the tmp or the life) I want to create the intensity characteristic (intst) its utility is varied:
-For the powered material: it would allow to light more or less an element of this category
(so to change their power) -after a while on a cable the sprk having an intst will disappear 
-on the swtch it will slow down the sprk 
(base the intst would be infinite but because of an element the sprk will lose more than the intst depending on the time of the element).