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प्रश्न
Why is the core of a transformer laminated?
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उत्तर
The core of a transformer is laminated to reduce the energy loss due to eddy currents.
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संबंधित प्रश्न
Express the turn ratio in terms of voltages.
Name two factors on which the magnitude of an induced e.m.f. in the secondary coil depends.
What is the turns ratio i.e., transformer ratio, ns: np, in an ideal transformer which in-creases ac voltage from 220 V to 33000 V?
What is the ideal transformer?
Distinguish between Step up and Step Down Transformer.
The primary of a transformer has 40 turns and works on 100 V and 100 W. Find a number of turns in the secondary to step up the voltage to 400 V. Also calculate the current in the secondary and primary.
For an ideal step-down transformer, the quantity which is constant for both the coils is ______.
A step-down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
1 MW power is to be delivered from a power station to a town 10 km away. One uses a pair of Cu wires of radius 0.5 cm for this purpose. Calculate the fraction of ohmic losses to power transmitted if
- power is transmitted at 220 V. Comment on the feasibility of doing this.
- a step-up transformer is used to boost the voltage to 11000 V, power transmitted, then a step-down transfomer is used to bring voltage to 220 V. (ρCu = 1.7 × 10–8 SI unit)
In a transformer, number of turns in the primary coil are 140 and that in the secondary coil are 280. If current in primary coil is 4 A, then that in the secondary coil is ______.
An ideal transformer converts 220 V a.c. to 3.3 kV a.c. to transmit a power of 4.4 kW. If primary coil has 600 turns, then alternating current in secondary coil is ______.
When is an emf induced in the neighbouring coil?
How is the laminated soft iron core made?
Which loss is reduced by laminations in the core?
What does the primary coil draw from the source?
Which description of the secondary coil is correct?
What is the induced EMF in the primary coil?
