Consider a tank which is filled with water and placed at some heights. This tank has a pipe connection that is going downwards to another tank in the ground level. The height difference between the 2 tanks can be considered as the potential difference (which measures in "voltage" ) and the flow of water from the tank 1 to tank 2 can be considered as the "current" . And the funny part is one day a stone got stucked in halfway of pipe and the water flow reduced, which can be considered as the term "resistance"😀