ALTERNATING CURRENT AND DIRECT CURRENT
2 marks · EasyA 30 W charger is used for 2 hours.
(a)[2 marks]
Calculate the total energy transferred in joules.
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(a) 216000 J
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Marking points
M1 (a) · 1 mark · Converts 2 hours to 7200 seconds and recalls E = P × t.
A1 (a) · 1 mark · Calculates 30 × 7200 = 216000 J.
Worked solution
Convert 2 hours to seconds: 2 × 3600 = 7200 s.