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प्रश्न
State the principle of a step-up transformer. Explain, with the help of a labeled diagram, its working ?
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उत्तर
Transformer:
Principle: It is a device which converts high voltage AC into low voltage AC and vice-versa. It is based upon the principle of mutual induction. When alternating current is passed through a coil, an induced emf is set up in the neighbouring coil.
Working: When an alternating current is passed through the primary, the magnetic flux through the iron core changes, which does two things. It produces emf in the primary and an induced emf is also set up in the secondary. If we assume that the resistance of primary is negligible, then the back emf will be equal to the voltage applied to the primary.
`therefore V_1 = -N_1 (dphi)/(dt)`
and`,V_2 = -N_2 (dphi)/dt`
Where, N1 and N2 are number of turns in the primary and the secondary respectively and V1 and V2 are their voltages respectively
In a step-up transformer: N2 > N1, therefore, V2 > V1
संबंधित प्रश्न
Write the function of a transformer.
How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of the coil in them?
Name the phenomenon ?
Name two kind of energy loss in a transformer. How is it minimized?
Mention the two characteristic properties of the material suitable for making core of a transformer.
Describe briefly, with the help of labelled diagram, working of a step-up transformer.
A step-up transformer converts a low voltage into high voltage. Does it not violate the principle of conservation of energy? Explain.
A transformer lowers e.m.f. 220 V to 12 volts. If the number of turns in primary are 8800, how many turns are in secondary coil?
The primary and secondary coils of a transformer each have an inductance of 200 x 10-6 H. The mutual inductance between the windings is 4 x 10-6 H. What percentage of the flux from one coil reaches the other?
In an ideal transformer, the turns ratio is \[\frac {N_p}{N_s}\] = \[\frac {1}{2}\]. The ratio Vs : Vp is equal to (the symbols carry their usual meaning) ______.
In an ideal transformer, the turns ratio is `N_p/N_s = 1/2`. The ratio Vs : Vp is equal to (the symbols carry their usual meaning):
