Answer:

A variable range of resistors built inside a box that can be varied as per our convenient. For example a set of kilo ohm resistors will be there,if u want 3 kilo ohm resistor then using the knob u can change the resistor value to your desired value. similarly there will be another set of resistors in mega ohm etc

First answer by ID2057571006. Last edit by ID2057571006. Question popularity: 2 [recommend question].