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2 marksAlternating Currents

CAPE Physics Unit 2 · 2001 · Paper 1 · Question 5(b)(ii)

An ideal transformer stepping up generator supply from 500 V at 15 A to 10 000 V over a 20 Ω cable, then stepped down to 500 V.

Calculate the power lost in the transmission cable.

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Other parts of this question

  1. 5(a)With the aid of a labelled diagram explain the principle of operation of an ideal transformer.[5 marks]
  2. 5(b)(i)Calculate the current in the transmission cable.[1 mark]
  3. 5(iii)Calculate the percentage power lost in the transmission cable if the voltage was not stepped up.[2 marks]

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