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4 marksAlternating Currents

CAPE Physics Unit 2 · 2005 · Paper 2 · Question 6(c)

A power station delivers 15 MW at 60 kV along transmission cables of total resistance 12 Omega.

Calculate what percentage of the power transmitted is lost in the cables.

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Other parts of this question

  1. 6(a)Draw a labelled diagram of a transformer suitable for transforming from 240 V a.c. to 12 V a.c. Give details of the materials used in its structure and reasons…[8 marks]
  2. 6(b)(i)Calculate the peak value of the primary voltage.[2 marks]
  3. 6(b)(ii)Calculate the turns ratio N_p / N_s of the transformer.[2 marks]
  4. 6(b)(iii)Calculate the power that must be supplied to the transformer when the secondary current is 10 mA.[2 marks]
  5. 6(b)(iv)Calculate the current rating of the fuse to be used in the primary circuit.[2 marks]

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