Electromagnetic devices are tools that use electric and magnetic fields to perform various functions. Common examples include motors, which convert electrical energy into mechanical motion, and generators, which do the opposite by converting mechanical energy into electrical energy. These devices rely on the principles of electromagnetism, discovered by scientists like James Clerk Maxwell. Another type of electromagnetic device is the transformer, which changes the voltage of electricity for efficient transmission. Electromagnets are also significant; they create a magnetic field when an electric current flows through them, allowing for applications in magnetic locks and MRI machines. These devices play a crucial role in modern technology.