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Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
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In a transformer energy is conveyed from primary to secondary through
Cooling coil
Air
Flux
None of the above
Flux
In a transformer, energy transfer occurs through mutual induction. The alternating current in the primary winding creates a time-varying magnetic flux in the core, which links with the secondary winding to induce an electromotive force (EMF).
In a transformer, energy transfer occurs through mutual induction. The alternating current in the primary winding creates a time-varying magnetic flux in the core, which links with the secondary winding to induce an electromotive force (EMF).
e=тИТNdtd╬жтАЛ тАФ Faraday's Law of Induction describing the induced EMF
VsтАЛVpтАЛтАЛ=NsтАЛNpтАЛтАЛ=a тАФ Transformer turns ratio
When an AC supply is applied to the primary, it produces a core flux ╬ж=╬жmтАЛsin(╧Йt). According to Faraday's Law, this flux induces voltage in both windings. Because the flux is confined within the magnetic core, it acts as a medium that couples the two electrical circuits magnetically without a physical electrical connection.
The magnetic core provides a low reluctance path for the flux.
The process relies on Faraday's Law of Electromagnetic Induction.
Transformers can only operate on AC, as DC produces a constant flux that does not induce voltage.
Electrical isolation is maintained between primary and secondary windings.
Allows for efficient voltage level transformation.
Provides galvanic isolation between circuits.
Cannot transform DC voltage.
Susceptible to core losses (hysteresis and eddy currents).
Power transmission and distribution systems.
Impedance matching in electronic circuits.
Option A (Cooling coil) is for thermal management to dissipate heat, not for energy transfer.
Option B (Air) is generally an insulator; transformers use high-permeability magnetic cores (laminated steel) to confine flux effectively.
C is correct тАФ The transformer operates on the principle of mutual induction, where the alternating magnetic flux acts as the medium for conveying energy from the primary to the secondary winding.
Remember that transformers rely on the rate of change of flux (d╬ж/dt); hence, they are 'frequency-dependent' devices that cannot function with steady-state DC.