Physics · May / June 2023 · Paper 61 · Question 4
0625
As printed in the paper
The question as text
A student investigates the change in resistance of a lamp filament when the current in the lamp is increased. The following apparatus is available: • a power supply • a low-voltage filament lamp • an ammeter • a voltmeter • connecting wires. Other apparatus normally found in a school laboratory is also available. Plan an experiment to investigate the change in resistance of the lamp filament when the current in the lamp is increased. Resistance R is given by the equation R = V I, where V is the potential difference (p.d.) across the lamp and I is the current in the lamp. You should: • draw a diagram of the circuit used • explain briefly how to do the investigation, including how to change the current • draw a table, or tables, with column headings, to show how to display your readings (you are not required to enter any readings in the table) • explain how to use your readings to reach a conclusion.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
MP1
circuit diagram – power supply, lamp and ammeter in series, voltmeter in suitable position to read V across lamp MP2
measure the current and potential difference
MP3
calculate resistance
MP4
repeat with at least two other currents / voltages / settings of variable resistor / power supply
MP5 a way to change the current/voltage (e.g. adjusting / using variable resistor OR changing voltage of power supply OR adding batteries)
MP6 table with columns for potential difference, current and resistance, headed with quantities and appropriate units MP7 plot graph of resistance against current OR compare values of resistance and current in table
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