In Resistor combinations: How many values using 1kohm resistors?, Glen Chenier showed us how many combinations of resistor combinations you can get. Many people commented, trying to develop a formula ...

Given an infinite grid array of resistors of value R, find the Thevenin equivalent resistance from A to B in terms of R. potential. This is equivalent to imagining there is a grounded conducting ring ...

You are looking at the input port of an infinite ladder circuit with a common ground node. All resistors have the same resistance R. What is the equivalent resistance you see? Replace all resistors by ...