sekundäärikelasta

Sekundäärikela, often referred to as a secondary coil, is a fundamental component in electromagnetic induction. It is typically a coil of wire wrapped around a core, which may be the same core as a primary coil or a separate one. The principle of operation of a secondary coil is based on Faraday's Law of Induction, which states that a changing magnetic field through a coil will induce an electromotive force (EMF), or voltage, across the coil.

In a transformer, a secondary coil works in conjunction with a primary coil. When an alternating current flows through the primary coil, it generates a continuously changing magnetic field. This changing magnetic field then permeates the core and passes through the secondary coil. As a result, an alternating voltage is induced in the secondary coil. The magnitude of this induced voltage is determined by the ratio of the number of turns in the secondary coil to the number of turns in the primary coil, as well as the voltage applied to the primary coil. This allows transformers to step up or step down voltage levels.

Beyond transformers, secondary coils find applications in other electromagnetic devices. For instance, in induction coils, a secondary coil with a very large number of turns is used to generate high voltages, often for ignition systems or spark generation. In wireless power transfer systems, a secondary coil receives the electromagnetic energy transmitted by a primary coil, converting it back into electrical energy. The design and placement of a secondary coil are crucial for its intended function, influencing its efficiency and the characteristics of the induced current or voltage.