Why do we find many industrial sensors equipped with a current output but no voltage output? This article provides the answer to this question and throws in plenty of other considerations.It’s rare for contact resistance to cause problems when you’re experimenting in your home lab. The only time you might notice anything is if you use, let’s say, a cheap and nasty breadboard or some elderly cables. But in industrial systems, unpredictable line resistances occur on a daily basis, creating a situation that pushes analogue systems based around voltage outputs to their limits.