Electric Charge Flow Question paper Level Subject Exam Board Topic Sub-Topic Booklet GCSE Physics CCEA Electricity Electric Charge Flow Question paper Time Allowed: 78 minutes Score: /65 Percentage: /100
Foundation Tier 1
1 (a) The diagram below shows two 1.5 V cells connected to two lamps. The two lamps are lit. (i) In the space below draw the circuit diagram, using the standard symbols, for the circuit shown above. [4] (ii) When the two lamps are lit the current flowing in the circuit is 0.2 A. Each cell provides a voltage of 1.5 V. Calculate the total resistance of the circuit. You are advised to show clearly how you get your answer. Remember to give a unit with your answer. Resistance [4] 2
(b) Zoe was given a sealed box containing a component that conducts electricity. Two terminals attached to the box allowed her to connect it to a circuit. To find out what the component was she decided to investigate how the current passing through the component depended on the voltage across it. (i) Complete the circuit diagram below by inserting a switch, an ammeter, a voltmeter and a variable resistor that would allow Zoe to obtain a series of values of the voltage and the current. [4] power supply of fixed voltage component in a box The results of her investigation are shown in the graph opposite. 3
Current in amps 0.8 0.6 0.4 0.2 0 0 2 4 6 8 Voltage in volts (ii) Is the current proportional to the voltage? Explain your answer. [2] (iii) Does the resistance of the component remain constant as the current and voltage are changed? Explain your answer. [2] (iv) What type of component is inside the box? [1] 4
(c) The photograph shows a girl touching an electrostatic generator. The generator gives the girl s hair a positive charge. Ted Kinsman / Science Photo Library (i) Describe how her hair acquires a positive charge. [1] (ii) When she touches an object a small spark is seen. What particles are moving in the spark and in what direction do they move? 1. The particles a 2. The direction in which they move [2] 5
Higher Tier 6
2 (a) The diagram below represents a lamp which can be connected to the 12 V battery. 12 V (i) Using the correct symbol show, on your diagram, how a voltmeter should be connected to measure the voltage across the lamp. [1] (ii) Mark, on the diagram, the positive terminal of the voltmeter. [1] (iii) When the switch is closed a current of 2 A flows in the circuit. Calculate the resistance of the lamp. Remember to give the unit for resistance. You are advised to show clearly how you get your answer. Resistance [4] 7
(iv) Calculate the combined resistance of two such lamps connected in series. You are advised to show clearly how you get your answer. Combined resistance [2] (v) Calculate the combined resistance when the two lamps are connected in parallel. You are advised to show clearly how you get your answer. Combined resistance [2] 8
(b) An electric shower is rated at 8 kw when used on a 240 volt power supply. Fuse Shower 8kW, 240V (i) Calculate the size of the current flowing in the shower circuit when it is operating. You are advised to show clearly how you get your answer. Current A [4] (ii) Calculate the cost of using this shower for 15 minutes. Th cost e of a kwh is 13.5 pence. You are advised to show clearly how you get your answer. Cost pence [3] 9
Save My Exams! The Home of Revision (c) Duringalightningstriketheaveragecurrent flowingis40000aandtheamountofelectric chargedeliveredis5c. istockphoto / Thinkstock (i) Nametheunitofelectriccharge. [1] (ii) Calculatethedurationoftheaveragestrike. You are advised to show clearly how you get your answer. Duration s[4] (iii) Iftheenergydischargedis700 106Jwhatisthevoltageofthe strike? Voltage volts[3] 10
3 (a) (i) Draw a circuit diagram showing the apparatus you would set up to obtain the current voltage characteristic (I V graph) for a filament lamp. Use the correct circuit symbols. [4] 11
(ii) Describe in detail how you would carry out this experiment. In your answer you should explain what is done to obtain a series of measurements of current and voltage. In this question you will be assessed on your written communication skills including the use of specialist science terms. [6] 12
The graph below shows how the resistance of the filament inside the lamp changes with temperature. 14 12 10 resistance of filament/ω 8 6 4 2 0 0 500 1000 1500 2000 2500 3000 temperature/ C 13
(iii) Use the graph to find the temperature of the filament when the voltage across it is 1.2 V and the current flowing through it is 0.2 A. You are advised to show clearly how you get your answer. Temperature = o C [3] 14
Save My Exams! The Home of Revision (b) The photograph shows a solar panel on the roof of a house. This is made up of a number of photocells. The photocells produce electricity directly from sunlight. solar panel Zoonar RF/ Thinkstock The information below is part of the manufacturer s specification of a single photocell. Peak voltage Peak current Area of photocell 0.75 V 420 ma 18 cm2 Each photocell behaves like a tiny battery. The solar panel consists of many photocells and produces an output of 240 V. (i) In what way are the photocells connected electrically to produce an output of 240 V? [1] (ii) By first finding the number of photocells needed to produce a peak voltage of 240 V, calculate the minimum area of this solar panel. Give your answer in cm2. Minimum area of panel = cm2 [3] 15
(iii) In the brightest conditions each solar panel can produce 100 W of electrical power. Calculate the area of the roof which must be covered with solar panels if the total output power is to be 3.2 kw. Give your answer in m 2. Remember 1 m 2 is an area measuring 100 cm 100 cm. Area = m 2 [3] 16