A transformer is a device that converts voltage. In most homes, transformers reduce the voltage for use on low-voltage equipment, such as thermostats and doorbells.At Lima's Handy Man, we believe that routine maintenance and common sense can help you through most basic electrical issues. For instance, if a light's out, start by checking the bulb, but before you undertake any electrical project, you definitely want to consult a professional. Here at Lima's Handy Man, we're more than happy to help you with any electrical issues you might have, but we offer these simple electrical tips to help you better maintain and identify electrical issues as part of our ongoing effort to provide the best possible electrical services to our customers.