Electric fans are often controlled by a knob which the user turns to power the fan on or off, and control the fan's speed.
On a lot of fans, the knob goes immediately from the off position to the highest speed, followed by the other speed settings in descending order.
For example on the picture below, you can see the knob going from the off position ('0') to the highest ('3'), and then the other two in descending speed order ('2', '1').
Why is that?
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