# Circuit symbol. Each of the cells has a potential difference of 1.5 volts. Figure 1. Use the correct answer from the box to complete the sentence.

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1 Q.(a) Draw one line from each circuit symbol to its correct name. Circuit symbol Name Diode Light-dependent resistor (LDR) Lamp Light-emitting diode (LED) (3) Figure shows three circuits. The resistors in the circuits are identical. Each of the cells has a potential difference of.5 volts. Figure Circuit Circuit 2 Circuit 3 (i) Use the correct answer from the box to complete the sentence. half twice the same as The resistance of circuit is... the resistance of circuit 3. () Page

2 Calculate the reading on voltmeter V 2. Voltmeter reading V 2 =... V () (iii) Which voltmeter, V, V 2 or V 3, will give the lowest reading? Draw a ring around the correct answer. V V 2 V 3 () (c) A student wanted to find out how the number of resistors affects the current in a series circuit. Figure 2 shows the circuit used by the student. Figure 2 The student started with one resistor and then added more identical resistors to the circuit. Each time a resistor was added, the student closed the switch and took the ammeter reading. The student used a total of 4 resistors. Figure 3 shows three of the results obtained by the student. Figure 3 Page 2

3 Number of resistors in series (i) To get valid results, the student kept one variable the same throughout the experiment. Which variable did the student keep the same? () The bar chart in Figure 3 is not complete. The result using 4 resistors is not shown. Complete the bar chart to show the current in the circuit when 4 resistors were used. (2) (iii) What conclusion should the student make from the bar chart? () (Total 0 marks) Q2.(a) Electrical circuits often contain resistors. The diagram shows two resistors joined in series. Calculate the total resistance of the two resistors.... Total resistance =... Ω () Page 3

4 A circuit was set up as shown in the diagram. The three resistors are identical. (i) Calculate the reading on the voltmeter. Reading on voltmeter =... V (2) The same circuit has now been set up with two ammeters. Draw a ring around the correct answer in the box to complete the sentence. smaller than The reading on ammeter A 2 will be equal to the reading on ammeter A. greater than () (Total 4 marks) Page 4

5 Q3.(a) Madeley High School The diagram shows the information plate on an electric kettle. The kettle is plugged into the a.c. mains electricity supply. 230 V 2760 W 50 Hz Use the information from the plate to answer the following questions. (i) What is the frequency of the a.c. mains electricity supply? () What is the power of the electric kettle? () To boil the water in the kettle, 2400 coulombs of charge pass through the heating element in 200 seconds. Calculate the current flowing through the heating element and give the unit. Use the correct equation from the Physics Equations Sheet. Choose the unit from the list below. amps volts watts Current =... (3) (c) The amount of charge passing through the heating element of an electric kettle depends on the time the kettle is switched on. Page 5

6 What pattern links the amount of charge passing through the heating element and the time the kettle is switched on? (2) (Total 7 marks) Page 6

7 Q4.(a) A student uses some everyday items to investigate static electricity. Madeley High School A strip of plastic is cut from a plastic carrier bag 2 The plastic strip is rubbed with a cloth 3 The plastic strip is hung over a wooden rod (i) Draw a ring around the correct answer in the box to complete each sentence. Rubbing the plastic strip with a cloth causes the strip to become negatively charged. electrons This happens because neutrons move from the cloth onto the plastic strip. protons a negative The cloth is left with a positive charge. zero (2) When the plastic strip is hung over the wooden rod, the two halves of the strip move equally away from each other. What two conclusions should the student make about the forces acting on the two halves of the plastic strip? (2) Page 7

8 Electrical charges move more easily through some materials than through other materials. Through which one of the following materials would an electrical charge move most easily? Draw a ring around your answer. aluminium glass rubber () (Total 5 marks) Q5. (a) The diagram shows a simple circuit. (i) Calculate the total resistance of the two resistors in the circuit. Total resistance =... Ω () Calculate the reading on the voltmeter. Use the correct equation from the Physics Equations Sheet. Show clearly how you work out your answer. Voltmeter reading =... V (2) Page 8

9 (iii) Draw a ring around the correct answer in the box to complete the sentence. decrease Replacing one of the resistors with a resistor of higher value will not change increase the reading on the ammeter. () The voltmeter in the circuit is replaced with an oscilloscope. Which one of the diagrams, X, Y or Z, shows the trace that would be seen on the oscilloscope? Write your answer, X, Y or Z, in the box. Diagram Give a reason for your answer (2) (Total 6 marks) Page 9

10 Q6. The diagram shows an electrical circuit. (a) Complete the two labels on the diagram. P and Q are meters. What is meter P measuring?... (2) What is meter Q measuring?... (2) (Total 4 marks) Q7. (a) The diagram shows how static electricity is used to paint a metal car panel. Use words from the box to complete the following sentences. attract opposite repel same All the paint droplets have the same type of charge. This makes the paint droplets... each other and spread out. The car panel and the paint droplets have the... type of charge. This causes the car panel to... the paint droplets. The car panel is covered by an even layer of paint. (3) Page 0

11 In which one of the following situations is static electricity dangerous and not useful? Put a tick ( ) in the box next to your answer. using a photocopier refuelling an aircraft a smoke precipitator Give a reason for your answer (2) (Total 5 marks) Q8. A student used the apparatus below to find out how the resistance of a light-dependent resistor (LDR) depends on light intensity. The resistance of the LDR was measured directly using a multimeter. (a) (i) Which one of the following is the correct circuit symbol for a LDR? Draw a ring around your answer. () Page

12 Name one factor that will affect the intensity of the light hitting the LDR. () The manufacturer of the LDR provides data for the LDR in the form of a graph. Describe how the resistance of the LDR changes when the light intensity increases from 00 lux to 300 lux (2) Page 2

13 (c) The student only obtained three results. These are given in the table. Madeley High School Light intensity Resistance in kilohms Dark 750 Bright 00 Very bright (i) The student could not use the results to draw a line graph. Why not? () Do the student s results agree with the data the manufacturer provided? Draw a ring around your answer. YES NO Give a reason for your answer. () (d) Which one of the following circuits probably includes a LDR? Tick ( ) one box. A circuit that automatically switches outside lights on when it gets dark. A circuit that automatically switches central heating on and off. A circuit that automatically turns lights off when no one is in the room. () (Total 7 marks) Page 3

14 Q9. (a) The diagram shows the circuit used by a student to measure the power of a filament lamp. Name a component connected in parallel with the filament lamp.... () By adding another component to the circuit, the student is able to obtain a range of ammeter and voltmeter readings. Ammeter reading in amps Voltmeter reading in volts (i) Which one of the following components did the student add to the circuit? Draw a ring around your answer. fuse switch variable resistor () What is the range of ammeter readings taken by the student? from... amps to... amps () Page 4

15 (iii) Use the data in the table and the equation in the box to calculate the maximum power of the filament lamp. Show clearly how you work out your answer Power =... W (3) (c) Complete the following sentence by drawing a ring around the correct line in the box. increases As the temperature of a filament lamp increases, its resistance remains constant decreases () (Total 7 marks) Page 5

16 Q0. The drawing shows three identical cells and two identical lamps joined in a circuit. (a) Use the correct symbols to draw a circuit diagram for this circuit. (3) Each of the cells provides a potential difference (voltage) of.5 volts. What is the total potential difference (voltage) provided by all three cells?... volts () (c) Complete this sentence by crossing out the two lines in the box that are wrong. The current through lamp 2 will be the current through lamp. () (Total 5 marks) Page 6

17 Current electricity E/D questions mark schemes M.(a) allow mark for each correct line if more than one line is drawn from any symbol then all of those lines are wrong 3 (i) half 3(V) (iii) V (c) (i) potential difference / voltage of the power supply accept the power supply accept the voltage / volts accept number of cells / batteries accept (same) cells / batteries do not accept same ammeter / switch / wires bar drawn height.(00)a ignore width of bar allow mark for bar shorter than 3 rd bar 2 (iii) as the number of resistors increases the current decreases [0] M2.(a) 25(Ω) Page 7

18 (i) 2(V) allow mark for showing a correct method, ie 6 / 3 2 equal to [4] M3.(a) (i) 50 (Hz) 2760 (W) 2 allow mark for correct substitution, ie 2400/200 or allow mark for 2760/230 provided no subsequent step shown 2 amps (c) the charge is directly proportional to the time switched on for accept for mark the longer time (to boil), the greater amount of charge or positive correlation or they are proportional 2 [7] M4.(a) (i) electrons Page 8

19 a positive (forces are) equal accept (forces are)the same forces are balanced is insufficient (forces act in) opposite directions accept (forces) repel both sides have the same charge is insufficient aluminium [5] M5. (a) (i) or their (a)(i) x 0.3 correctly calculated allow mark for correct substitution, ie 0.3 x 5/their (a)(i), provided no subsequent step 2 decrease Y accept any correct indication reason only scores if Y is chosen accept voltage for p.d. Page 9

20 (only one that) shows a direct current / p.d. or a battery / cell gives a direct current accept both X and Z are a.c. or a battery/cell gives a constant current/p.d. accept it s a constant current/p.d. it is not changing is insufficient [6] M6. (a) (i) diode [Do not accept rectifier or LED] lamp / bulb / light each for mark 2 P = voltage / potential difference / p.d. / volts / V [Allow Voltmeter] Q = current / amperes / amps / A [Allow ammeter] each for mark 2 [4] M7. (a) repel opposite attract correct order only Page 20

21 refuelling an aircraft reason cannot score if refuelling aircraft is not chosen a spark may cause an explosion / fire / ignite the fuel accept the static for a spark accept named fuel there must be a consequence of having a spark do not accept answers in terms of people getting a shock or electrocuted [5] M8. (a) (i) correct symbol ringed accept any suggestion that would change light intensity, eg: torch on or off accept power of torch do not accept watts / wattage of torch distance between torch and LDR lights in room on or off shadow over the LDR resistance decreases Page 2

22 from 600 kω to 200 kω accept by 400 kω (c) (i) no numbers for light intensity or light intensity is categoric / a description / not continuous not enough results is insufficient YES mark is for the reason both show that resistance increases with decreasing (light)intensity / brightness accept they both get the same results / pattern (d) A circuit that automatically switches outside lights on when it gets dark. [7] M9. (a) voltmeter and no other do not accept voltage (i) variable resistor accept accept accept Page 22

23 (iii) 3.3 (W) allow mark for correct data choice allow 2 marks for substitution of correct data i.e the following answers gain 2 marks 0.0 / 0.30 / 0.80 /.75 allow mark for substitution of incorrect of data incorrectly calculated e.g = 0.6 scores mark Madeley High School 3 (c) increases [7] M0. (a) circuit symbol for a lamp correct accept accept any standard of drawing providing circuit would work 4.5 circuit symbol for a cell correct 2 lamps drawn in parallel with 3 cells polarity of cells must be correct (+ to ) but cells may be either way around (c) the same as accept any clear indication of the correct answer [5] Page 23

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