What device produces electricity through the rotation of a coil within a magnetic field?

A generator is a device that converts mechanical energy into electrical energy through the principle of electromagnetic induction. When the coil within a generator is rotated in the presence of a magnetic field, it induces an electric current in the coil due to the motion of the conductors cutting across the lines of magnetic flux. This phenomenon is described by Faraday's law of electromagnetic induction, which states that a change in the magnetic environment of a coil will induce an electromotive force (EMF) in that coil.

The rotation of the coil can be achieved by various mechanical means, such as turbines powered by wind, water, or steam, allowing generators to produce electricity for a variety of applications, from small-scale power generation to large electric power plants.

In contrast, a transformer primarily changes the voltage of alternating current (AC) electricity without generating electricity, while a motor converts electrical energy into mechanical energy rather than producing it. A capacitor stores electrical energy temporarily and does not generate electricity through motion within a magnetic field. Thus, the generator is distinct as it is the device designed to produce electrical power through movement in a magnetic field.