There are a few synonyms for the term "power coil", all referring to various types of electrical components used in electrical systems. Some synonyms include "toroidal coil", which is a type of coil that is shaped like a donut and is commonly used in transformers and other power applications. Another synonym is "inductor", which is a component that stores energy in a magnetic field and is used to filter or regulate electrical current. Additionally, "solenoid coil" refers to a type of coil that is used to generate a magnetic field and is commonly found in motors, relays, and other electromechanical devices. Overall, these synonyms all refer to important components in electrical systems that play a crucial role in powering various devices and equipment.