The Sankey diagrams show the energy transfers in a...

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General Certificate of Secondary Education Higher Tier June 2013 Science A PH1HP Unit Physics P1 Physics Unit Physics P1 Thursday 13 June 2013 9.00 am to 10.00 am For this paper you must have: a ruler a calculator the Physics Equations Sheet (enclosed). Time allowed 1 hour Instructions Use black ink or black ball-point pen. Fill in the boxes at the top of this page. Answer all questions. You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. Do all rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for this paper is 60. You are expected to use a calculator where appropriate. You are reminded of the need for good English and clear presentation in your answers. Question 4(a) should be answered in continuous prose. In this question you will be marked on your ability to: – use good English – organise information clearly – use specialist vocabulary where appropriate. Advice In all calculations, show clearly how you work out your answer. PH1HP H (JUn13PH1Hp01) G/T95890 6/6/6/6/ Centre Number Candidate Number Surname Other Names Candidate Signature For Examiner’s Use Examiner’s Initials Question Mark 1 2 3 4 5 6 7 8 TOTAL
2 Do not write outside the box (02) G/T95890/Jun13/PH1HP Answer all questions in the spaces provided. 1 The Sankey diagrams show the energy transfers in a traditional coal-burning power station and a combined heat and power (CHP) station. Input energy from fuel Electricity Waste energy Traditional coal-burning power station Input energy from fuel Electricity Energy used to heat local homes, offices and factories Waste energy CHP station 1 (a) What effect does the waste energy from a power station have on the surroundings? ............................................................................................................................................ ............................................................................................................................................ (1 mark) 1 (b) Calculate the efficiency of the CHP station. Use the correct equation from the Physics Equations Sheet. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Efficiency = ............................................................. (2 marks)
3 Do not write outside the box (03) G/T95890/Jun13/PH1HP Turn over 1 (c) Why is a CHP station more efficient than a traditional coal-burning power station? ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (2 marks) 1 (d) A CHP station is usually used to meet the demand for electricity within the local area. The electricity is not transmitted and distributed through the National Grid. 1 (d) (i) What is the National Grid? Tick ( ) one box. A system of cables and pylons. A system of cables and transformers. A system of cables, transformers and power stations. (1 mark) 1 (d) (ii) Using the electricity locally and not transmitting it through the National Grid increases the overall efficiency of a CHP station by 7%. Give one reason why.

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