This video describes the concepts of the Wheatstone Bridge. The circuit is used to find the value of an unknown resistance. Four resistors are used. Two resistors in series are connected in parallel with two other resistors that are in series. Refer to the diagram in the video if the previous sentence is not clear. A galvanometer is connected between each series pair of resistors. One of the known resistors is adjusted until the current in the galvanometer is zero (this is the null part of the concept). The two equations that relate the voltage drops across resistors can be divided to provide the equation used to calculate the value of the unknown resistance (see the video for details). This material relates to Clhapter 21 of OpenStax College Physics. College Physics II
Prof. Greg Clements
