Resistors have been a part of almost every electronic circuit for well over 100 years. During that time, resistors have taken many forms. You can still find early resistors that resembled glass fuses ...

You probably have a resistor decade box in your lab used to find the best fixed-value resistor for an analog circuit. You may also use a decade box to verify the functionality of a circuit or system ...

One of those useful things to have around on your bench is a decade resistance box, essentially a dial-a-resistance instrument. They used to be quite expensive in line with the cost of close-tolerance ...