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3 marksResistance, R

CSEC Physics · 1995 · Paper 2 · Question 4(c)(ii)

The potential difference from the secondary coil of such a transformer is 18 V, and the charging current through the 12 V battery is 2 A. What is the value of the variable resistance?

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Other parts of this question

  1. 4(a)(i)The wire is moved up and down.[2 marks]
  2. 4(a)(ii)The wire is moved up and down faster.[1 mark]
  3. 4(a)(iii)The wire is moved from pole to pole horizontally.[1 mark]
  4. 4(a)(iv)The magnet poles are moved up and down with the wire stationary.[1 mark]
  5. 4(b)(i)is closed[1 mark]
  6. 4(b)(ii)remains closed[1 mark]
  7. 4(b)(iii)is opened.[1 mark]
  8. 4(c)(i)The symbol for a transformer is shown. Complete the circuit diagram to show how a transformer, together with the components listed below, could be used to…[5 marks]

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