Uses include light dimmers, volume controls, tone controls and voltage adjusters.
They can be pre-set and adjusted with a small screw driver or adjusted with a knob.
Potentiometer - uses all three pins and works as a voltage divider.
Variable Resistor - uses only two pins.
Corroded tracks can create nasty noises when the pot is adjusted.
Surface Mounted - 1 or 2 mm across.
These can be too small for the average amateur constructor to use!
Too small to colour code or label. If you mix them up, you are in trouble.
Capacitors look the same as resistors.
Zero Ohm Resistors
Zero ohm resistors exist. These are used instead of wires because robotic circuit board assembly machines are already able to work with standard resistor shapes. A whole new robot would be needed to work with wires so zero ohm resistors were invented.
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