Can you guess the stress in a 1- ohm resistance change? #sensors #electronic #diy #engineering

The story for strain gage electrical resistance goes back many decades. Originally, 120 Ω was used, because that value matched the impedance characteristics of the available instrumentation, and was a convenient enough value to manufacture in common sizes using 25 µm diameter wires. Modern instrumentation eliminates the requirement for 120 ohms, and allows for much higher resistances, if needed (for example, 5000 Ω).

[GroovesAndLands]

Simmons, Ruge and Wheatstone were very clever. What a basic resistive strain gage can/will do never fails to surprise.

Recently set up a batch of 2 million and 4 million pound transducers. They're sensitive to 100 lbs...which is to say the signal changes by enough uV/V on account of just 100lb force that a typical indicator will see the difference. That's 40, 000 divisions!