A transformer is referred to as a static device because it has no moving parts once it is constructed and operating. Unlike machines that typically involve mechanical components that move to perform their functions, transformers function purely based on electromagnetic principles and do not require any moving parts to transfer energy between windings.
A transformer is called a static device because it does not involve any mechanical motion in its operation. It relies solely on electromagnetic induction to transfer energy from one electrical circuit to another through mutual induction between its windings.
Static devices, in general, refer to equipment or devices that do not involve moving parts in their operation. They are designed to perform specific functions using principles such as electrical, magnetic, or thermal processes without requiring mechanical motion. Transformers fall under this category due to their operation solely based on electromagnetic induction and absence of mechanical components.
A transformer is called an AC (alternating current) device because it operates on the principle of electromagnetic induction, which is effective in transforming AC voltage levels. It is specifically designed to work efficiently with alternating current, stepping up or stepping down the voltage levels as required by the application.
A transformer is classified as a device rather than a machine primarily because it lacks mechanical components that would classify it as a machine. Machines typically involve moving parts that perform mechanical work, whereas transformers operate based on electromagnetic induction and do not involve any mechanical motion in their core function of voltage transformation. Therefore, a transformer is categorized as an electrical device designed to transfer electrical energy between circuits through electromagnetic induction.