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CAIE IGCSE Physics 4.5.2 The a.c. generator Question Bank

Practise a.c. generator diagrams and output graphs, linking coil position, slip rings, brushes, e.m.f. peaks, zeros and frequency.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • name slip rings and brushes on generator diagrams and state how they keep the circuit connected
  • link coil or magnet position to crests, troughs and zeros on an e.m.f.-time graph
  • calculate period or frequency from generator rotation data or from the output graph

Covered syllabus points

4.5.2.1—Simple form of a.c. generator4.5.2.2—And interpret graphs of e.m.f. against

4.5.2 The a.c. generator question 1

[Maximum number: 5]

Fig. 10.1 shows a simple alternating current generator.

Fig. 10.1

Fig. 10.1

Question (a)

(a)

On Fig. 10.2, sketch a graph to show how the electromotive force (e.m.f.) induced varies with time for one revolution of the coil. Assume that the coil starts in the horizontal position, as shown in Fig. 10.1.
Label the points on the time axis where the coil has completed 1 / 4 revolution and 3/4 revolution.

Fig. 10.2

Fig. 10.2

[ 3 ]

Question (b)

(b)

State the name of the components labelled P and Q and state their purpose.

Name:
Purpose:

[ 2 ]
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