Electricity has been a mysterious entity plaguing my mind since last year when I learnt about it in class. I am unable to understand why electrons move the way they do when a circuit is formed, nor what is the driving force to make them do so (which is voltage difference, and I don't understand that either). Electron flow has been analogued as a water pump system in class, and that does work in allowing me to visualise resistance etc, as how water in the analogue comes into contact with the walls of the pipe. However, the analogy fails to show me what is voltage, as the water pump does not magically work on it's own - it requires electricity. So, I'd like to be clearer on how electricity works, preferably explained with a visual image. As to superconductors, I already have an image of it, gained from some source on the web. The image is this - Normal conductors are shown as a messy train station, with electrons analogued as people, moving to the trains in a disorderly fashion, thereby bumping into other things (nuclei) and other people (hence the resistance). In superconductors, these people pair up and move to trains orderly, thereby not hitting anything. What I'd like to know is why electrons pair up in superconductors, especially since they should repel each other due to their like charges. Any response would be appreciated. Thanks!