AQA-PH1HP-QP-JAN13 - Centre Number For Examiners Use Candidate Number Surname Other Names Examiners Initials Candidate Signature Question General

# AQA-PH1HP-QP-JAN13 - Centre Number For Examiners Use...

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2 Do not write outside the box (02) G/K91149/Jan13/PH1HP Answer all questions in the spaces provided. 1 Diagram 1 shows the energy transferred per second from a badly insulated house on a cold day in winter. Through the roof 1.7 kJ/s Through the floor 0.7 kJ/s Through draughts 0.8 kJ/s Through the windows 0.7 kJ/s Through the walls 1.1 kJ/s Diagram 1 1 (a) (i) When the inside of the house is at a constant temperature, the energy transferred from the heating system to the inside of the house equals the energy transferred from the house to the outside. Calculate, in kilowatts, the power of the heating system used to keep the inside of the house in Diagram 1 at a constant temperature. 1 kilowatt (kW) = 1 kilojoule per second (kJ/s) ............................................................................................................................................ Power of the heating system = ............................................................ kW (1 mark)
3 Do not write outside the box (03) G/K91149/Jan13/PH1HP Turn over 1 (a) (ii) In the winter, the heating system is switched on for a total of 7 hours each day. Calculate, in kilowatt-hours, the energy transferred each day from the heating system to the inside of the house. Use the correct equation from the Physics Equations Sheet. ............................................................................................................................................ ............................................................................................................................................ Energy transferred each day = ............................................................ kWh (2 marks) 1 (a) (iii) Energy costs 15 p per kilowatt-hour. Calculate the cost of heating the house for one day. ............................................................................................................................................ Cost = .............................. (1 mark) Question 1 continues on the next page
4 Do not write outside the box (04) G/K91149/Jan13/PH1HP 1 (a) (iv) The heating system is switched off at midnight. The graph shows how the temperature inside the house changes after the heating system has been switched off.

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