Physics · May / June 2025 · Paper 61 · Question 4
0625
As printed in the paper
The question as text
0625/61/M/J/25 © UCLES 2025 4 A student investigates the relationship between the diameter and the resistance of wires. The following apparatus is available: • wires with different diameters • instrument for measuring the diameter of a wire • metre ruler • ammeter • voltmeter • power supply. Other apparatus normally found in a school laboratory is also available. Plan an experiment to investigate how the diameter of a wire affects its resistance. Resistance R is given by the equation R = V , where V is the potential difference (p.d.) across the wire and is the current in the wire. You do not need to write about safety precautions. In your plan: • draw a circuit diagram to show the circuit you use • explain briefly how to do the investigation • state one 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 used:
correct circuit diagram
MP2 measurements made:
measure wire diameter
AND measure voltage and current OR record voltmeter and ammeter readings
MP3 analysis of readings:
calculate / work out resistance of wire
MP4 performing the investigation:
repeat for at least two other diameters of wire
MP5 variable kept constant:
length / material of wire
MP6 table:
with columns for diameter of wire, voltage, current and resistance
each column must be labelled with both quantity and unit
MP7 conclusion:
plot a graph of resistance against diameter
OR an answer which suggests comparing values of diameter AND resistance in table
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