[clbrmbr]

The finite grid of resistors (or arbitrary impedances) is actually of great practical usefulness.

[Kirr]

This may be as good time as any to plug my calculator for finite resistor networks (including grids) [1]. It works by eliminating non-terminal nodes one by one with the Star-Mesh transform, while keeping the exact rational resistances at each point.

[1] https://kirill-kryukov.com/electronics/resistor-network-solv...