think of it as a closed system of waterfilled pipes, tubes and hoses with valves and nozzles. if you want to display something, you fill up certain points in a matrix with water and that builds the picture. a transistor is like a valve that is set by another watertubes pressure.
its not completely similar, but you can understand many things in electricity using this model. magnetic inducted electricity for example can not easyly be explained by this. maybe by pressing a hose from outside.
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