For all of the uses that we have in buildings for electricity, there has to be a system for converting it from the high voltages that you have running through those mighty power lines that you see running along the road, to the smaller and more manageable currents that we utilize within our households. The methods and instruments that are used for this are transformers, and they can range from high voltage ones to lower voltage transformers. In order to determine what type of transformer a house or commercial building will need, the testing of high voltage transformers is always in order.