3. Semi variable resistors
These are two terminal variable resistors designed for handling higher voltages and currents. These are constructed by resistive wire wrapped to form a toroid coil with the wiper moving over the upper surface of the toroid, sliding from one turn of the wire to the next. A rheostat is also made from resistance wire wound on a heat-resisting cylinder with the slider made from a number of metal fingers. The fingers can be moved along the coil of resistance wire by a sliding knob, thus changing the tapping point.
source: engineersgarage.com
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