Cambridge International AS & A Level · P3 · structured
Audit a proposed measuring circuit
AS practical 1: build and check a low-voltage circuit · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 8
- Topics
- 5
- Answer
- Complete
A student puts an ammeter across a 6 V supply and a voltmeter in series with a 100 ohm resistor. Produce a corrected labelled circuit and a short collection plan using only 0.5-3.0 V across the resistor. This is a written readiness task, not a practical competence test.
- (a)
Draw the corrected circuit.
2 marks - (b)
Give pre-connection checks.
2 marks - (c)
Specify the readings and range.
2 marks - (d)
State recording and safety actions.
2 marks
Ready to self-mark?Reveal the detailed answer guide
(a)
Draw the corrected circuit.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
(a) Draw the supply, switch, A and resistor as one loop; connect V across the resistor. Award 1 mark for each meter connection.
(b)
Give pre-connection checks.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
(b) Identify d.c. modes/sockets and safe ranges; output zero/open switch while wiring. Award 2 marks.
(c)
Specify the readings and range.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
(c) State at least six sensible settings spanning 0.5-3.0 V and read actual V with I at each; repeat a middle setting. Award 2 marks.
(d)
State recording and safety actions.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
(d) Record the original readings and annotate anomalies; open the switch for heating or faults and obtain a teacher check. Award 2 marks.
Complete marking guidance
Use these worked steps alongside the part-by-part answers. They explain the method and mark allocation; they do not add extra marks.
- (a) Draw the supply, switch, A and resistor as one loop; connect V across the resistor. Award 1 mark for each meter connection.
- (b) Identify d.c. modes/sockets and safe ranges; output zero/open switch while wiring. Award 2 marks.
- (c) State at least six sensible settings spanning 0.5-3.0 V and read actual V with I at each; repeat a middle setting. Award 2 marks.
- (d) Record the original readings and annotate anomalies; open the switch for heating or faults and obtain a teacher check. Award 2 marks.
Private on this device