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5 marksTransformers

CSEC Physics · January 2009 · Paper 2 · Question 6(a)

Figure 4 shows an ideal transformer being used to step down a 220V a.c. supply, in order to operate a low-voltage lamp.

Explain the principles involved in the workings of the transformer, and how it is able to step down the input voltage.

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Other parts of this question

  1. 6(b)(i)Calculate the voltage across the secondary coil of the transformer[9 marks]
  2. 6(b)(ii)Calculate the current in the secondary coil of the transformer[9 marks]
  3. 6(b)(iii)Calculate the electrical power dissipated in the lamp.[9 marks]
  4. 6(c)High voltages are used to transmit electrical energy over long distances through long-distance cables. State an advantage of using high voltages.[1 mark]

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