Knowing how to read circuits is a very useful skill that will help you out all the time. especially if you start messing around with building little electronics projects.
Variable resistors and potentiometers each augment the standard resistor symbol with an arrow. The variable resistor remains a two-terminal device, so the arrow is just laid diagonally across the middle. A potentiometer is a three-terminal device, so the arrow becomes the third terminal (the wiper).
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