Physics · Oct / Nov 2024 · Paper 61 · Question 4
0625
As printed in the paper
The question as text
0625/61/O/N/24 © UCLES 2024 4 A student investigates the current required to melt different fuse wires. Fig. 4.1 shows part of the circuit the student uses. The following equipment is also available: • fuse wires with a selection of different diameters and metals (all with the same length) • metre ruler • ammeter • variable resistor fuse wire Fig. 4.1 Plan an experiment to investigate how one factor affects the current required to melt a fuse wire. You do not need to write about safety precautions. In your plan: • state the variable that you choose to investigate • complete the circuit diagram on Fig. 4.1 • explain briefly how to do the investigation • state a key variable to keep constant • draw a table, or tables, with column headings, to display the readings (you are not required to enter any readings in the table) • explain how to use your results to reach a conclusion.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
MP1
CIRCUIT: Ammeter and variable resistor both shown in series with test wire and with correct symbols.
MP2
METHOD MARK 1: Adjust current / variable resistor until wire melts / current stops. Take current reading. MP3
THE CHOSEN VARIABLE: metal used or diameter
MP4
METHOD MARK 2: Repeat with other metal(s) or other diameter(s)
MP5
VARIABLE TO KEEP CONSTANT: Diameter of wire or metal used, provided it is not the variable chosen for MP3 MP6
TABLE with clear columns for current with unit A and for their chosen variable, with correct unit if appropriate. MP7
CONCLUSION: Plot graph of current against diameter OR bar chart of current against metal
OR compare the readings to see if the chosen variable affects the current at which the fuse wire melts
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