So, imagine you have a hose that’s connected to your outside tap.
The end of the hose has a twist nozzle (rheostat) that lets you adjust the water (voltage) from full blast down to closed (current).
The tap only has ‘on’ or off’ due to a design flaw. As soon as you turn it on (turn your fan from off to on), the full blast of water comes out of the hose.
When you twist the end of the nozzle on the hose, it begins limiting the amount of water depending on how much you twist it (resistance). Eventually, if you twist it enough, it blocks all the water (fan stops).
To make it easier for you, the manufacturer has put three indentations on the nozzle: High, medium, and low.
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