CAIE IGCSE Physics 4.5.2 The a C Generator Topic Practice

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Covered syllabus points

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

Question 1

[Maximum number: 2]

Fig. 8.1 shows how the electromotive force (e.m.f.) of a 60 Hz alternating current (a.c.) power supply varies with time.

Fig. 8.1

Fig. 8.1

Question (a)

(a)

Calculate the time period of the a.c.
time period =

[ 1 ]

Question (b)

(b)

Fig. 8.2 shows this power supply connected in a circuit.

Fig. 8.2

Fig. 8.2

[ 1 ]

Question (i)

(i)

State the name of component A .

[ 1 ]

Question 2

[Maximum number: 3]

Question (a)

(a)

Fig. 8.2 is a voltage-time graph showing the output of a simple alternating current (a.c.) generator at times t0,t1,t2t_{0}, t_{1}, t_{2} and t3t_{3}.

Fig. 8.2

Fig. 8.2

Fig. 8.3 is an end view of the plane of the coil of the generator at time t0t_{0}. The coil is rotating clockwise.

Fig. 8.3

Fig. 8.3

[ 3 ]

Question (i)

(i)

Draw an end view of the position of the plane of the coil at time t1t_{1}. Include the labels A and B .

[ 1 ]

Question (ii)

(ii)

Draw an end view of the position of the plane of the coil at time t2t_{2}. Include the labels A and B .

[ 1 ]

Question (iii)

(iii)

Draw an end view of the position of the plane of the coil at time t3t_{3}. Include the labels A and B.

[ 1 ]

Question 3

[Maximum number: 5]

Fig. 6.1 shows two bar magnets.

Fig. 6.1

Fig. 6.1

Question (a)

(a)

Fig. 6.2 shows the same bar magnets with a coil of wire between them.

Fig. 6.2

Fig. 6.2

[ 5 ]

Question (i)

(i)

Name the parts labelled A in Fig. 6.2.

[ 1 ]

Question (ii)

(ii)

Explain how rotating the coil in Fig. 6.2 continuously causes the galvanometer needle to show an alternating current.

[ 4 ]
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