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7 marksScientific Method

CSEC Physics · January 2013 · Paper 2 · Question 1(a)

Data showing primary voltage (Vp) and secondary voltage (Vs) were collected during a transformer test, as presented in Table 1.

On page 3, plot a graph of Vs against Vp.

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 1(b)Determine the gradient, S, of the graph.[4 marks]
  2. 1(c)(i)Use the gradient, S, to calculate the number of turns in the primary, Np, given that the number of turns in the secondary, Ns = 750.[4 marks]
  3. 1(d)(ii)Calculate the current in the secondary winding, if the primary current is 1.6 A.[3 marks]
  4. 1(d)(ii)If the current in the secondary winding is actually 0.15 A, calculate the efficiency of this transformer.[3 marks]
  5. 1(d)(ii)How would you know if this was 'an ideal transformer'?[1 mark]
  6. 1(e)State THREE features of the transformer that enable it to operate efficiently.[3 marks]

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