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Complete the sentences to describe how the fuse protects the kettle against a large current. Use words from the list. boil circuit heating cooling kettle freeze melt The large current causes a effect in the wire in the fuse. This causes the wire to and the fuse ‘blows’.
See it on the paper →State the name of component X.
See it on the paper →Fig. 3.1 shows a nuclear power station. nuclear power station Fig. 3.1 State the process in the nuclear power station that releases energy from nuclear fuel.
See it on the paper →The student repeats the procedure for lengths l = 500 mm, 700 mm, 800 mm, 900 mm and 1000 mm. The results are shown in Table 4.1. Suggest why it is good experimental technique to open the switch between each reading.
See it on the paper →Calculate the resistance R of the 400 mm length of resistance wire. Use the equation shown. R = V I Record the value of R in Table 4.1.
See it on the paper →Plot a graph of resistance R (vertical axis) against length of wire, l. Start your axes at (0,0).
See it on the paper →Draw the best-fit straight line.
See it on the paper →Use your graph to estimate the value of R at length l = 600 mm. R = Ω
See it on the paper →Calculate the gradient G of the line. Indicate on your graph the points that you use to calculate the gradient. G =
See it on the paper →Calculate the cross-sectional area A of the resistance wire. Use the equation shown. A = 0.00049 G If you do not have a value for G in (c)(iv) use G = 0.005 here. This is not the correct value for G. A = mm 2
See it on the paper →Candidates were very familiar with the circuit symbol for a heater. The most common mistake was to suggest ‘fuse’. The term ‘radiator’ was not accepted.
— Examiner report, February/March 2025, 0653/42 Q9(b)(i) (Cambridge)
Some candidates stated nuclear fission correctly. Others stated nuclear fusion, nuclear power, combustion, thermal energy, or exothermic reaction. It was important for candidates to have the correct spelling and clear handwriting in this response. A response such as nuclear fuission did not gain credit as it was not clear whether (nuclear) fusion or fission was intended.
— Examiner report, February/March 2024, 0653/32 Q3(a) (Cambridge)
Few candidates knew about the wire heating as current flows, or the change in resistance.
— Examiner report, May/June 2021, 0653/62 Q4(a)(ii) (Cambridge)
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