Just when you think you understand circuits, there's always a curve ball to derail you and leave you scratching your head.
The diagram below is a Triac/Diac speed controller for a reciprocating saw. At the top of the diagram, you'll notice there is a black wire from the right brush of the motor, a yellow wire to a resistor switch and a white wire connected to neutral. They are pigtailed together.
Although the diagram appears to be correct and works, I am confused as to why it works. If electricity chooses the path of least resistance, shouldn't the current leaving the black wire go directly through the white wire and back to neutral? Shouldn't it bypass the speed and trigger switches?
What adds insult to injury is that current bypasses the resistor in the speed switch when it is closed. Why does it bypass in. this case and not the other?