What is a cylindrical coil of wire called that becomes electromagnetic when a current passes through it?

A cylindrical coil of wire that becomes electromagnetic when a current passes through it is known as a solenoid. When electricity flows through the wire, it creates a magnetic field in and around the coil due to the electromagnetic effect, which can be harnessed for various applications, including acting as an electromagnet.

The unique structure of a solenoid, with its tightly wound coil, enhances the magnetic field generated compared to a straight wire carrying the same current. The strength and direction of the magnetic field produced by the solenoid can also be controlled by adjusting the current flowing through it.

In contrast, a transformer is a device used to change the voltage of alternating current in a circuit and typically consists of two coils (windings) rather than just one coil like a solenoid. A motor converts electrical energy into mechanical energy, while a generator does the opposite, converting mechanical energy into electrical energy. Both of these devices may utilize solenoids as part of their design, but they are not synonymous with the term for a coil that creates a magnetic field with the flow of current.