Quelpr
1 markInduced e.m.f.

CSEC Physics · 1992 · Paper 2 · Question 4(a)(vii)

Operation of a d.c. dynamo, electromagnetic induction, and transformers.

If instead of increasing the number of turns of wire, the speed of rotation of the coil is increased with no other change, state the effect, if any, on the peak value of the output current.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 4(a)(i)Write in the name of the components labelled A, B, C and D on the dotted lines provided.[4 marks]
  2. 4(a)(ii)The terminals X and Y are connected to a 2 Ω resistor. The peak value of the potential difference is 4 V. Calculate the peak value of the output current.[1 mark]
  3. 4(a)(iii)The coil makes 10 revolutions in one second. On the axes provided, sketch a graph to represent the variation of output current with time during the first two…[3 marks]
  4. 4(a)(iv)If the number of turns of wire on the coil is increased, with no other change, state the effect, if any, on the frequency of the output current.[1 mark]
  5. 4(a)(v)If the number of turns of wire on the coil is increased, with no other change, state the effect, if any, on the peak value of the output current.[1 mark]
  6. 4(a)(vi)If instead of increasing the number of turns of wire, the speed of rotation of the coil is increased with no other change, state the effect, if any, on the…[1 mark]
  7. 4(b)A mechanic states that a transformer cannot be used with the d.c. dynamo to obtain a higher potential difference as transformers work only with alternating…[4 marks]

More practice: the rest of this paper · more Induced e.m.f. questions · all CSEC Physics past papers