What causes a voltage change from a transformer primary to its secondary?
When current is reduced, the magnetic field strength reduces. When the magnetic lines of flux flow around the core, they pass through the turns of the secondary winding, causing a voltage to be induced into the secondary coil.
What is the principle of transformer .explain the working of transformer explain how laminating the core of a transformer helps to reduce eddy current losses in it why the primary and secondary coils of a transformer are preferably wound on the same core?
(a) Laminations are thin, making the resistance higher. Eddy currents are confined within each thin lamination. This reduces the net eddy current. (b) For maximum sharing of magnetic flux and magnetic flux per turn to be the same in both primary and secondary.
What is a transformer explain the principle construction working and Theory of a transformer How is current affected in a transformer What are the various energy losses in a transformer how can they be reduced?
Transformer – Working Principle If the second coil circuit is closed, a current flows in it and thus electrical energy is transferred magnetically from the first to the second coil. The alternating current supply is given to the first coil and hence it can be called as the primary winding.
What are the various energy losses in a transformer how can they be reduced?
Heat loss due to eddy current can be reduced by the lamination of the iron core. 3. The heat generated can be kept to a minimum by using a magnetic material which has a low hysteresis loss.
In what sense eddy currents are considered undesirable in a transformer?
Thus, eddy currents occur in the stator and rotor cores of electric motors and generators, in transformers, metallic recording heads (used in magnetic recording), and the like. These eddy currents can produce undesirable effects such as power loss, heating, and—in magnetic recording—degradation in performance.
How are eddy current Minimised in a transformer?
Answer. eddy current is minimised in a transformer by using a thick iron core made up of thin iron sheets in the shape of U and T placed alternately insulated with paint or varnishes. by doing so the a closed path for magnetic field is provided.