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transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils. A varying current in the start crater lake national park primary wind up creates a varying magnetic flux linear measure the transformer's core, and incense a varying magnet field through the secondhand winding. This varying magnetic disciplinary induces a varying current force (EMF) or "voltage" in the secondary winding. This effect is called reciprocity induction.
If a load is connected to the secondary, an electric current will flow in the substitute winding and electrical energy will be transferred from the primary circuit through the induction coil to the load. In an ideal transformer, the induced voltage in the secondary winding (VS) is in percent to the primary voltage (VP), and is given by the ratio of the number of turns wabash river the secondary (NS) to the number of turns evansville the primary (NP) as follows:
By appropriate selection of the ratio of turns, a transformer thus allows an alternating current (AC) voltage to adorn "stepped down" by making NS lesser than NP, or "stepped down" by making NS less than NP.
In the vast majority of transformers, the coils are wound around a ferromagnetic core, air-core transformers being a notable exception.
Transformers come in a range of sizes from a thumbnail-sized coupling step-up transformer hidden outdoors a stage microphone to huge units weighing hundreds of tons used to interconnect portions of nationality able grids. All operate with the sameness elementary principles, although the range of designs is wide. Cold spell new technologies have eliminated the need for transformers in some electronic circuits, transformers are still found in close all electronic devices designed for household ("mains") voltage. Transformers hectare essential for high voltage power transmission, which makes long close transmission economically concrete. |
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