Any child knows the answer is the garden hose. Why then do we draw comparisons between fluids and electricity? They're bad analogies.
While the tire is on top of the water hose no fluid will pass the point where the weight of the truck is pinching the hose closed, obviously.
Will the weight of the tire impede the flow of electricity through the extension cord? No it won't, obviously.
Liquid, water in this case will flow through the hose from point a to point b in a single direction.
Electrical current can only flow in a circuit, so it will move in both directions, away from and back to the source. It is not impeded by gravity, it will travel up and down at the same rate.
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