a) State the principal of transformer.
b) Explain with the help of example of a well labelled diagram . Its working and construction . What are the uses of transformers.
Answers
Principal of transformer.....)
A transformer consists of two electrically isolated coils and operates on Faraday's principal of “mutual induction”, in which an EMF is induced in the transformers secondary coil by the magnetic flux generated by the voltages and currents flowing in the primary coil winding.....!
Construction and Working:
Construction and Working:This principle can be demonstrated and explained through Faraday's experiments.
Construction and Working:This principle can be demonstrated and explained through Faraday's experiments.A transformer consists of primary and secondary coils insulated from each other, wound on a soft iron core (figure). To minimise eddy current a laminated iron core is used. The a.c. input is applied across the primary coil. The continuously varying current in the primary coil produces a varying magnetic flux in the primary coil, which in turn produces a varying magnetic flux in the secondary. Hence, an induced emf is produced across the secondary.
Construction and Working:This principle can be demonstrated and explained through Faraday's experiments.A transformer consists of primary and secondary coils insulated from each other, wound on a soft iron core (figure). To minimise eddy current a laminated iron core is used. The a.c. input is applied across the primary coil. The continuously varying current in the primary coil produces a varying magnetic flux in the primary coil, which in turn produces a varying magnetic flux in the secondary. Hence, an induced emf is produced across the secondary.
Construction and Working:This principle can be demonstrated and explained through Faraday's experiments.A transformer consists of primary and secondary coils insulated from each other, wound on a soft iron core (figure). To minimise eddy current a laminated iron core is used. The a.c. input is applied across the primary coil. The continuously varying current in the primary coil produces a varying magnetic flux in the primary coil, which in turn produces a varying magnetic flux in the secondary. Hence, an induced emf is produced across the secondary. be the number of turns in the primary and secondary coils respectively. Since same flux links with the primary and secondary, the emf induced per turn of the two coils must be the same
Thus a step up transformer increases the voltage by decreasing the current, which is in accordance with the law of conservation of energy. Similarly a step down transformer decreases the voltage by increasing the current.
Thus a step up transformer increases the voltage by decreasing the current, which is in accordance with the law of conservation of energy. Similarly a step down transformer decreases the voltage by increasing the current.
Thus a step up transformer increases the voltage by decreasing the current, which is in accordance with the law of conservation of energy. Similarly a step down transformer decreases the voltage by increasing the current. The energy losses of a transformer are (i) Copper less, (ii) Hysteresis loss, (iii) Eddy current loss, (iv) Flux loss.
principal=>
- The transformer is based on the principle of electromagnetic induction. The phenomenon of producing an induced emf due to the changes in the magnetic flux associated with a closed circuit is known as electromagnetic induction.
Construction and Working=>
- This principle can be demonstrated and explained through Faraday's experiments.
- A transformer consists of primary and secondary coils insulated from each other, wound on a soft iron core (figure). To minimise eddy current a laminated iron core is used. The a.c. input is applied across the primary coil. The continuously varying current in the primary coil produces a varying magnetic flux in the primary coil, which in turn produces a varying magnetic flux in the secondary. Hence, an induced emf is produced across the secondary.
- Let E P and E Sbe the induced emf in the primary and secondary coils and N P and N Sbe the number of turns in the primary and secondary coils respectively. Since same flux links with the primary and secondary, the emf induced per turn of the two coils must be the same.
