This document discusses measurement using current and voltage transformers. It defines current transformers (CTs) and voltage transformers (VTs), explaining their functions and how to calculate turns ratios and ratio errors. An experiment is described to use a VT and CT to measure the power of a load. Key differences between CTs and VTs are that CTs connect in series with the power circuit and their secondary connects to an ammeter, while VTs connect in parallel and their secondary connects to a voltmeter.