sliding resistor
Technical term in electronics for a variable resistor adjusted by sliding a contact along a resistive element.
In this circuit, we adjust the voltage using a sliding resistor.
可変抵抗器 is a broader term for any variable resistor, while 滑り抵抗器 specifically refers to the sliding-contact type.
Compound of 滑り (sliding) + 抵抗器 (resistor), describing its mechanism.