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What is a transformer?

What is a transformer?

a transformer is an electrical device that transfers electrical energy between two or more circuits by electromagnetic induction. commonly, transformers are used to increase or decrease AC voltages in power applications.

a variable current in the primary winding of the transformers creates a variable magnetic flux in the transformer core and a variable magnetic field striking the secondary winding of the transformer. This variable magnetic field at the secondary winding induces an electromotive force (emf) or a variable voltage in the secondary winding. By using Faradays law in conjunction with high magnetic permeability core properties, transformers can be designed to effectively alter AC voltages from one voltage level to another within power grids.

transform is a static electrical device (in that it has no moving parts) used to convert electrical current at a constant frequency from one voltage level to another. it is based on the Faradays law of electromagnetic induction which states that when a closed loop conductive coil is subjected to a changing flux, an electromotive force is induced there. Note, the transformer is an AC device. it can only work on an AC voltage. as the input is an AC voltage, the magnitude changes sinusoidally or, in fact, in any way, as long as it changes, the flux in the coil changes. Transformers are many types, the one we are talking about is the 2-coil transformer. the input voltage is given to the primary coil. being an alternating current, the flux changes. As a result, the flux associated with the secondary coil, which is magnetically coupled to the primary, changes and an electromotive force is induced. for a more detailed study, always refer to a standard reference book.


a transformer is a static device with constant power (neglected losses) which transforms a power under a voltage level into another voltage level without a change of frequency.

Basically, electrical energy is a product of two terms: voltage and current. thus, power can be transmitted

at low and high voltage levels

or at high and low voltage levels. The basic electrical concept

is that current is the main cause of losses and, therefore, the current must be lower to reduce losses and, therefore, option 2 is preferred for the transport of energy .

but the high voltage current can not be generated or used directly. therefore, a transformer is required at the plant to increase the voltage level (boost transformer) as well as at the distribution side to reduce the voltage level (step-down transformer).

it is a device to intensify, increase and lower the AC voltage. a trans is used at the plant so that the power of your building is not attenuated en route.

once it reaches your building, a step-down transformer brings it back to the required voltage of 220V.

it works on the principle of electromagnetic induction. There are 2 reels, one primary and one secondary. the primary coil induces a current in the secondary coil.

to step up the secondary to more than no turn while in stepdown the primary has no number. of turns. the coils are wound on a soft iron core so as to increase the induction and are laminated with mica so as to avoid eddy currents which can lead to unnecessary generation of heat and loss of power.

hope it was useful



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