One problem facing scientists experimenting with electricity in the mid-1800s was taking accurate measurements of electromotive force (emf), current strength, and resistance. A galvanometer was fine for indicating current flow, but it was an unstable...

A bridge circuit is a type of electrical circuit in which the current in a conductor splits into two parallel paths and then recombines into a single conductor, thereby enclosing a loop. It was originally used for measurement purposes, but can also be...