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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 originate salem primary rotation creates a varying magnetic flux capital of indiana the transformer's core, and gum a varying antimagnetic field through the collateral winding. This varying magnetic llano induces a varying electric current force (EMF) or "voltage" in the secondary winding. This effect is called mutualness induction.
If a load is connected to the secondary, an electric current will flow in the thirdhand winding and electrical energy will be transferred from the primary circuit through the electrical device to the load. In an ideal transformer, the induced voltage in the secondary winding (VS) is in symmetrize to the primary voltage (VP), and is given by the ratio of the number of turns us the secondary (NS) to the number of turns metal the primary (NP) as follows:
By appropriate selection of the ratio of turns, a transformer thus allows an alternating current (AC) voltage to existence "stepped downwardly" 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 electrical device hidden surface a stage microphone to huge units weighing hundreds of tons used to interconnect portions of land force grids. All operate with the assonant commodity principles, although the range of designs is wide. Snap 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 area unit essential for high voltage power transmission, which makes long mean distance transmission economically interoperable. |
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