Student: Circuit Diagram and Spring Balance

Topics: Circuit diagram, Angle, Measurement Pages: 10 (1318 words) Published: February 13, 2013
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Centre No. Candidate No.
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4420/03

4437/09

Examiner’s use only

London Examinations IGCSE
Physics – 4420
Paper 3

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Science (Double Award) – 4437
Paper 9

1 2 3 4

Foundation and Higher Tiers
Wednesday 4 November 2009 – Afternoon Time: 1 hour 15 minutes Materials required for examination Ruler, protractor, compasses, pencil and calculator Items included with question papers Nil

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In the boxes above, write your centre number, candidate number, your surname, initial(s) and signature. The paper reference is shown at the top of this page. Write the one for which you have been entered. Check that you have the correct question paper. Answer ALL the questions. Write your answers in the spaces provided in this question paper. Show all the steps in any calculations and state the units. Calculators may be used.

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N34942A
W850/U4420/57570 5/7/6/3/

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1.

A student’s torch uses a 1.5 V supply. She investigates the lifetime of two different supplies. For each one, she connects the supply to the lamp from her torch in a series circuit. She records the current in the lamp. She records the current again after 8 hours. The circuit symbol for a lamp is

(a) (i) Draw a suitable circuit diagram for this investigation.

(3) (ii) Describe how the student would perform this investigation. ................................................................................................................................ ................................................................................................................................ ................................................................................................................................ ................................................................................................................................ ................................................................................................................................ (3)

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(b) An ammeter reading from her investigation is shown below. Record this reading. 0.4 0.2 0 0.6 0.8 1.0

A
................................................... A (1) (c) Four power supplies are shown below.

9 V battery 1.5 V dry cell

0–1.5 V supply

rechargeable 1.5 V cell

Only two of these are suitable for her torch. Circle these two. Give reasons why the other two are unsuitable. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (3)

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(d) The student has to find the power of her lamp. She connects a voltmeter to her circuit. The circuit symbol for a voltmeter is V

Draw this voltmeter on your circuit diagram in part (a)(i). (1) (e) The student uses a light dependent resistor (LDR) to measure the brightness of the lamp....