Whether the lubricating oil toner is coupled with the conductor?
But with graphite, it will make the metal contact sheet and the whole resistance to form the passage, rheostat can not change the role of resistance. I actually lubricate, that is, with cotton swabs dipped in lubricating oil, and then put a touch on it.
You don't want to lubricate the rheostat. The metal piece in it is in direct contact, so even the lubricating insulator won't make any difference (as long as you don't rub it too much).
Not really. It depends on the amount of graphite powder. If the graphite powder forms a continuous through zone, it can be considered a conductorYou can use lubricating oil, preferably not with graphite, which will cause the sliding rheostat to fail
