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3 marksTransformers

CSEC Physics · May/June 2011 · Paper 2 · Question 5(b)(i)

Electrical power produced by Powergen in Trinidad is stepped up from 11 000 V at 8 000 A to 110 000 V for transmission to Tobago.

If the number of turns in the secondary coil is 900, calculate the number of turns in the primary coil for an ideal transformer.

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Other parts of this question

  1. 5(a)(i)State TWO advantages of using a.c. to transmit electrical power.[2 marks]
  2. 5(a)(ii)Draw a diagram of a simple transformer indicating the features which enhance efficiency.[4 marks]
  3. 5(b)(ii)Calculate the transmission current for the ideal transformer referred to at (b) (i).[3 marks]
  4. 5(b)(iii)Calculate the transmission power if the transformer is 70% efficient.[3 marks]

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