... troubleshooting electrical equipment and control circuits, it is important to understand the basic principles on which the electrical equipment works. The following sections will outline the basic electrical ... about single-phase and three-phase transformers, AC and DC machines. In this context, we will study the electrical circuits and their construction, design, testing, operation, and maintenance. ... Troubleshooting of Electrical Equipment and Control Circuits Voltage is defined as the electrical potential difference that causes electrons to flow. Current is defined as the flow of electrons and is...