मराठी

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?

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प्रश्न

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?

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उत्तर

`E_S/E_P = N_S/N_P`

Here e.m.f. is directly propotional to number of turns.

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2017-2018 (March) Set A

संबंधित प्रश्‍न

Explain why an induced current must flow in such a direction so as to oppose the change producing it.


Can a transformer be used with direct current source? Give reason.


A transformer lowers e.m.f. from 220 V to 15 V. If the number of turns in primary are 3520, how many turns are in the secondary coil?


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Read the following paragraph and answer the question:


Long distance power transmissions

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A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. The number of turns in the secondary in order to get output power at 230 V are ______.


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

  1. power is transmitted at 220 V. Comment on the feasibility of doing this.
  2. 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)

An ideal transformer converts 170 V a.c. to 1.70 KV a.c. to transmit a power of 3.4 KW. If primary coil has 500 turns then alternating current in secondary coil is ______.


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