I'm certainly a novice in the area of circuits and physics, but somewhat interested. I was pondering the idea of a closed energy circuit. My thought would be applied to vehicles. Is it possible to have a car with two batteries. One battery powering the car's wheel, the other in reserve. A dynamo is attached to the wheel charging the reserve battery. When the battery that is powering the wheel is expended the reserve battery takes over, it is switched over to powering the wheel and the spent battery is now switched to the dynamo to be charged. The cycle would seemingly continue endlessly. The only fail to this idea is the efficiency of the system that would gradually diminish the cycle, no wasted energy; and the dynamo must charge at the same rate as the battery discharge to keep it balanced. I'm sure there are a few general laws physics this violates, hence my query