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electricity f questions 2022

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A student investigated how the current in a filament lamp varied with the potential difference across the filament lamp. The diagram below shows part of the circuit used. (a) Complete above diagram... by adding an ammeter and a voltmeter. Use the correct circuit symbols. (3) The graph below shows some of the results.(b) The student reversed the connections to the power supply and obtained negative values for the current and potential difference. Draw a line on the graph to show the relationship between the negative values of current and potential difference. (2) (c) Write down the equation which links current (I), potential difference (V) and resistance (R). ___________________________________________________________________ (1) (d) Determine the resistance of the filament lamp when the potential difference across it is 1.0 V. Use data from the graph above. (a) ammeter and voltmeter symbols correct 1 voltmeter in parallel with lamp 1 ammeter in series with lamp 1 (b) smooth curved line of correct shape do not accept a line that becomes horizontal 1 passing through - 4.0 V, - 0.2 A or – 6.0 V, - 0.23 A 2nd mark conditional on scoring 1st mark 1 (c) potential difference = current × resistance or V = IR 1 (d) I = 0.08 (A) 1 1.0 = 0.08 × R allow 1.0 = their I × R provided their I has been obtained from the graph 1 R = allow R = 1 R = 12.5 (Ω) allow an answer consistent with their I 1 (e) ammeter displays a reading when not connected (to a circuit) [Show More]

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