ELECTRICITY QUESTIONS AND ANSWERS
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6 Terms
EXAMINAR REPORT
Just over 20% of students were able to obtain both marks by being able to extract pertinent information from the question. Many students assumed that the 12 V was across the 25 Ω resistor; on this occasion these students obtained one mark for use of V = IR.
EXAMINAR REPORT
Poor performance in this question was largely due to limited use of appropriate technical language. Answers lacked a clear communication of the physics of why resistance varies in the filament lamp
EXAMINAR REPORT
32% of students were able to score both marks. Many students failed to appreciate that the lamp and resistor were in parallel and simply determined the current in the lamp and quoted the total resistance as the lamp’s resistance.
EXAMINAR REPORT
45.7% were able to obtain both marks in (e). In (e), many students determined the power output across the lamp rather than the total power output of the battery.
EXAMINAR REPORT
Very few students showed any understanding of the difference between the two circuits and how this affected the voltage range and the efficiency. Just over 2% of students scored 2 or more marks
