Syllabus Edition

First teaching 2020

Last exams 2024

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Resistance (CIE AS Physics)

Exam Questions

57 mins33 questions
1a
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3 marks

The photograph shows a statue of Buddha in Sri Lanka, which is protected by a lightning conductor.

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During a storm, a potential difference of 2.7 MV was generated between a cloud and the top of the lightning conductor on the statue. A flash of lightning passed between the cloud and the lightning conductor, producing a current of 25 kA for a time of 7.5 ms.

Calculate the energy transferred by the lightning strike.



Energy transferred = ............................................

1b
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3 marks

The lightning conductor is made from copper.  

Sketch an I–V graph for the rod when it conducts a lightning strike to earth

1c3 marks

Explain any changes which the lightning rod would undergo during a lightning strike.

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2a3 marks

Fig. 1.1. shows the graph of V against I for a non-ohmic conductor.

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Fig. 1.1.

Calculate the maximum resistance of the lamp over the range shown by the graph.

2b2 marks

Using the axes in Fig. 1.2. sketch the graph of current against potential difference for a diode.

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Fig. 1.2.
2c3 marks

For the graph in Fig. 1.3. determine

9-2-2c-m-iv-graph-3
Fig. 1.3.
i)
the resistance when current = 10 mA
[2]
ii)
the power when current = 10 mA
[1]

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3a2 marks

An electrical component has the I-V characteristic shown in Fig. 1.1.

9-2-3a-m-iv-graph-2

Fig. 1.1

Determine the resistance of the component when a potential difference of 6.0 V is applied across it.

 

3b2 marks

For the component in part (a) calculate the minimum value of R as the potential difference across it changes over the range 0-10 V.

3c6 marks

For the component in part (a) calculate   

(i)
The power dissipated when V = 2.0 V
[2]
(ii)
The maximum power dissipated before the component heats up 
[2]
(iii)
The value of resistance at the point identified in part (ii)
[2]

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