Edexcel IGCSEPhysicsGeneral Applications10 Marks

This question is about mains electricity.

(a)State the potential difference of the mains supply in the UK.[1]
(b)State two differences between direct current (d.c.) and alternating current (a.c.).[2]
(c)(i)An electric kettle operates at a potential difference of 230 V. The power of the kettle is 2.8 kW. Calculate the current in the kettle. Show your working.[3]
(c)(ii)Calculate the energy transferred by the kettle in 4.0 minutes. Show your working.[4]

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Mark scheme

Marking points from the official mark scheme. The mark or mark type is shown in brackets.

13 (a) B1 for 230 (V)
13 (b) B1 for d.c. flows in one direction and a.c. changes direction / flows backwards and forwards
B1 for d.c. (constant) voltage/current and a.c. (continuously) changing voltage/current (magnitude)
13 (c)(i) M1 for conversion 2.8 kW = 2800 W
M1 for P = V × I OR I = P/V
A1 for 2800 / 230 = 12.2 (A)
13 (c)(ii) M1 for (time conversion) 4.0 × 60 = 240 (s)
M1 for E = P × t OR E = V × I × t
M1 for 2800 × 240 OR 230 × 12.2 × 240
A1 for 672 000 (J) OR 6.72 × 10⁵ (J)

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