Motors · CSEC Physics

9 past-paper questions on Motors, part of Electricity and Magnetism, from every CSEC Physics paper on Quelpr.

1. 5(a)(ii)3 marks· CSEC Physics · 1990 · Paper 2A split-ring commutator is connected to the a.c. generator. On the axes provided, draw a graph to represent the output current assuming no other change in the circuit.
2. 1(c)(i)3 marks· CSEC Physics · 1997 · Paper 2Explain why the coil begins to rotate when a current is passed through it.
3. 1(c)(ii)1 mark· CSEC Physics · 1997 · Paper 2What extra device is needed to ensure that the coil continues to rotate?
4. 5(a)(iv)2 marks· CSEC Physics · 2021 · Paper 2Explain why a split-ring (commutator) is used in a d.c. motor.
5. 4(a)6 marks· Physics Q4 4(a)With reference to the d.c. motor shown in Figure 3, explain how the coil is able to rotate continuously.
6. 4(a)(i)5 marks· Physics Q4 4(a)(i)Explain how this motor works.
7. 4(a)(ii)1 mark· Physics Q4 4(a)(ii)Give the purpose of the commutator.
8. 6(b)(i)1 mark· Physics Q6 6(b)(i)Name the part labelled X.
9. 6(b)(ii)9 marks· Physics Q6 6(b)(ii)Explain what happens when the switch is closed. Your answer should include the direction of the current, the forces acting, any rules applied, the direction of rotation and how continuous rotation is achieved.