ELECTRICITY 2022 examinable questions and answers.GCSE QUESTIONS, RATED A+,.

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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. ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ Resistance = _______________ Ω (4) (e) A second student did the same investigation. The ammeter used had a zero error. What is meant by a zero error? ___________________________________________________________________ ___________________________________________________________________ (1) (Total 11 marks)Q2. The photograph below shows an LED torch. (a) The torch contains one LED, one switch and three cells. Which diagram shows the correct circuit for the torch? Tick (✓) one box. (1) (b) Write down the equation which links charge flow (Q), current (I) and time (t). ___________________________________________________________________ (1) (c) The torch worked for 14 400 seconds before the cells needed replacing. The current in the LED was 50 mA. Calculate the total charge flow through the cells. [Show More]

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