Theory: answer each printed part. For drawings, upload a clear photo of your sketch on the supplied figure; show working and units for calculations.
(a)(i)Read question and case materials as text
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A simple alternating current (a.c.) generator supplies electricity at a remote location.
Fig. 7.1 shows the generator with its horizontal rotating coil. Identify components P and Q.
A simple alternating current (a.c.) generator supplies electricity at a remote location.
Fig. 7.1
Fig. 7.1 shows the generator with its horizontal rotating coil. Identify components P and Q.
Answer guidance
Identify Name it and, where the marks allow, say what led you there.
[1 mark]
(a)(ii)
Fig. 7.1 shows the generator. P stays stationary while Q rotates. Explain their purpose in producing an electrical output.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[2 marks]
(b)(i)Read question and case materials as text
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A simple alternating current (a.c.) generator supplies electricity at a remote location.
Fig. 7.2 is the oscilloscope trace with Y-gain 5.0 V/cm and timebase 2.0 ms/cm. Put X on the trace at one position where the coil is vertical.
Fig. 7.2 is the oscilloscope trace with Y-gain 5.0 V/cm and timebase 2.0 ms/cm. Put X on the trace at one position where the coil is vertical.
Fig. 7.2
[1 mark]
(b)(ii)
Using Fig. 7.2 and Y-gain 5.0 V/cm, determine the generator’s maximum e.m.f. in volts.
Answer guidance
Using You must use the thing it names. An answer that reaches the right value another way may not score.
[2 marks]
(b)(iii)
Using Fig. 7.2 and timebase 2.0 ms/cm, find the time for one coil revolution in milliseconds.
Answer guidance
Using You must use the thing it names. An answer that reaches the right value another way may not score.
[1 mark]
(b)(iv)
Using the oscilloscope trace in Fig. 7.2 and the 2.0 ms/cm timebase, determine the frequency of the generator output in hertz.
Answer guidance
Using You must use the thing it names. An answer that reaches the right value another way may not score.
[2 marks]
5054/21/O/N/23Cambridge O Level Physics 5054 · Oct/Nov 2023 · Paper 2 variant 1 · Question 7