AO / Question Answers Extra information Marks Spec ref. 01.1 The current flows one way and then Remove marks for any 1 AO1 the other. extra boxes ticked. P2.3.1 The frequency is 50 Hz. 1 01.2 neutral and live Award no marks if two 1 AO1 boxes ticked. P2.3.1 AO1 01.3 0 V 1 P2.3.1 02.1 To step-up the potential difference 1 AO1 between power station and cables 1 P2.4.3 02.2 The higher potential difference a No marks for efficiency 1 AO1 lower current. increases. 1 P2.4.3 This reduces the rate of energy transfer from the cables 02.3 For: gives access to mains electricity Accept any sensible 1 AO3 answers. Against: unsightly OR danger of 1 WS 1.4 children climbing 03.1 3.5 × 4 Accept 14 (V) with no 1 AO2 working shown for 2 marks. 14 (V) 1 P2 AO1 03.2 = potential difference × current Accept 1 P = V I P2.4.1 Allow error carried forward 03.3 14 × 5 1 AO1×1 from 03.1 for full marks. 70 1 AO2×2 Accept 70 with no working W 1 P2.4.1 shown for 2 marks. AO1 03.4 energy transferred = power × time Accept 1 E = P t P2.4.2 Allow error carried forward 03.5 70× 600 (s) 1 AO2 from 03.3. 42 000 (J) 1 P2.4.2 70 × 10 (min) = 700 1 1 mark. Accept 42 000 with no 03.6 systematic error 1 AO3 WS 3.7 04.1 energy transferred = charge 1 AO1 flow × p.d. P2.4.2 04.2 18.0 × 12 1 AO2 216 J 1 P2.4.2 04.3 Measure the energy transferred 1 AO2
Question Answers Extra information Marks AO / Spec ref. 01.1 The current flows one way and then the other. The frequency is 50 Hz. Remove marks for any extra boxes ticked. 1 1 AO1 P2.3.1 01.2 neutral and live Award no marks if two boxes ticked. 1 AO1 P2.3.1 01.3 0 V 1 AO1 P2.3.1 02.1 To step-up the potential difference between power station and cables 1 1 AO1 P2.4.3 02.2 The higher potential difference a lower current. This reduces the rate of energy transfer from the cables No marks for efficiency increases. 1 1 AO1 P2.4.3 02.3 For: gives access to mains electricity Against: unsightly OR danger of children climbing Accept any sensible answers. 1 1 AO3 WS 1.4 03.1 3.5 × 4 14 (V) Accept 14 (V) with no working shown for 2 marks. 1 1 AO2 P2 03.2 = potential difference × current Accept P = V I 1 AO1 P2.4.1 03.3 14 × 5 70 W Allow error carried forward from 03.1 for full marks. Accept 70 with no working shown for 2 marks. 1 1 1 AO1×1 AO2×2 P2.4.1 03.4 energy transferred = power × time Accept E = P t 1 AO1 P2.4.2 03.5 70× 600 (s) 42 000 (J) Allow error carried forward from 03.3. 70 × 10 (min) = 700 1 mark. Accept 42 000 with no 1 1 1 AO2 P2.4.2 03.6 systematic error 1 AO3 WS 3.7 04.1 energy transferred = charge flow × p.d. 1 AO1 P2.4.2 04.2 18.0 × 12 216 J 1 1 AO2 P2.4.2 04.3 Measure the energy transferred 1 AO2
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