4 13100.03 Question 2 Requirements • 1 × 820 μF capacitor > 2 V working voltage • 1 × 120 μF capacitor > 2 V working voltage • 1 × red, 1 × black 4 mm binding post panel mount • 2 × 4 mm connecting wire • white adhesive labels • SPDT switch • enclosure 85 × 60 × 40 mm or larger • 1.5 V cell • 1.5 V cell holder • digital voltmeter range 0 – 2 V reading to 0.001V Preparation Drill holes in the enclosure and mount the SPDT switch and the red and black binding posts in the front panel. Solder the capacitors inside the box so the circuit and the underside of the lid of the box will look like Fig. 2.1. black binding post + + 820μF 120μF red binding post Fig. 2.1 5 13100.03 Ensure the circuit and capacitors are sealed inside the box so that they cannot be viewed by the students. Use the white sticky labels to draw the corresponding circuit as shown in Fig. 2.2 onto the front of the box between the exposed switch and binding posts. Label position 1 and position 2 on the label as shown in the Fig 2.2. Position 1 Position 2 Switch C1 C2 Fig. 2.2 Check Turn the switch to position 2. Place two connecting wires in the red and black post bindings. Connect the wires to the +ve and –ve terminals of the 1.5 V cell. Remove the wires from the cell and attach to the voltmeter. The voltmeter should read approximately 1.5 V. Turn the switch to position 1 then back to position 2 again. The reading on the voltmeter should drop to about 87% of its original value. Setup for Practical Place the enclosure on the desk next to the voltmeter and cell inside the cell holder. Place two connecting wires in the red and black post bindings and label these wires positive and negative respectively. Ensure the SPDT switch is in position 2. Touch the positive and negative wires together to ensure C1 is fully discharged. Action at changeover Disconnect circuit from cell/voltmeter. Return switch to position 2. Touch the positive and negative wires together to ensure C1 is fully discharged. + + 6 13100.03 7 13100.03 13100.03 13100.04 ADVANCED General Certificate of Education 2022 APPARATUS AND MATERIALS LIST Physics Assessment Unit A2 3A Practical Techniques and Data Analysis [APH31] FRIDAY 13 MAY, MORNING 2 13100.04 PHYSICS UNIT 3 (A2 3A) APPARATUS AND MATERIALS REQUIRED FOR PRACTICAL ASSESSMENT CONFIDENTIAL This document gives preliminary information on the apparatus and materials required for the A2 Practical Assessment. Information about the apparatus and materials required for this assessment must NOT be communicated to students. If apparatus/materials have their serial code and/or manufacturer specifi ed then it is essential that centres use this exact apparatus/material. On receipt of this APPARATUS AND MATERIALS LIST, centres must contact Gavin Gray, ggray@ccea.org.uk immediately if they have difficulty in sourcing the specified apparatus or materials. Teachers will be given detailed instructions for setting up the experiment in the Confi dential Instructions for Physics Practical Test, to which they will have confi dential access from April 2022. Teachers will have confi dential access to a copy of the experimental test two working days (48 hours) before the start of the assessment. The A2 3 Practical Techniques Assessment is a test of practical skills consisting of two experimental tests (40 marks). The duration of the assessment is 1 hour. The apparatus in the following list will allow for one experiment to be set up for the practical test which makes up questions 1–2. In other words, each set of apparatus (as listed on page 3) will accommodate two candidates when doing the circus of experiments. The apparatus can be used for alternative sessions according to the following schedule: Friday 13 May 2022 Physics A2 3A (APH31) (Main Session) 9.15 am–10.15 am (First Alternative) 10.30 am–11.30 am (Second Alternative) 11.45 am–12.45 pm (Third Alternative) 1.15 pm–2.15 pm (Fourth Alternative) 2.30 pm–3.30 pm One set of apparatus for A2 3A (APH31) will therefore be suffi cient for ten candidates on Friday 13 May if the Main Session and all four alternatives are used. A laboratory may contain one, two, three or more sets of apparatus. This means that two, four, six, eight or more candidates can be accommodated in the same session. To maintain the confi dentiality of details of the practical tests, candidates entered for any of the alternative sessions must be segregated within the centre so that there can be no contact with candidates who have taken an earlier test in any centre. IMPORTANT NOTICE Centres are urged to order items needed for the Physics Practical Test from the suppliers as soon as possible.