Electric coils are loops of wire that create a magnetic field when an electric current flows through them. They are commonly used in various devices, such as transformers, inductors, and motors, to store energy or convert electrical energy into mechanical energy. The strength of the magnetic field depends on the number of loops and the amount of current. These coils can be made from different materials, typically copper, due to its excellent conductivity. Electric coils are essential in many applications, including electromagnets, which are used in cranes to lift heavy metal objects, and in wireless charging systems for smartphones.