1. Which of the following appliances makes use of the heating effect of electricity?
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1 Name: ( ) Class: Date: ASSIGNMENT Chapter 15: Practical Electricity 25 Multiple-Choice Questions (10 marks) 1. Which of the following appliances makes use of the heating effect of electricity? A Electric escalator B Electric fan C Electric rice cooker D Fluorescent lamp ( C ) 2. Which of the following is a unit of energy? A Coulomb per second B Newton per metre C Volt per coulomb D Watt second ( D ) 3. A 50 Ω resistor is connected in series with a 9.0 V battery. What is the power loss in the resistor? A 0.45 W B 0.62 W C 1.6 W D 5.6 W ( C ) 4. The earth wire of an electrical appliance should be connected to the A fuse. B metal casing. C neutral wire. D plastic handle. ( B ) 5. The cost of electricity is 27 cents per kwh. What is the cost of using a W iron at maximum power for 45 minutes? A 12.2 cents B 14.6 cents C 24.3 cents D 1458 cents ( C ) 2013 Marshall Cavendish International (Singapore) Private Limited 1
2 6. Which of the following statements is true? A B C D A fuse should be connected to the live wire. A fuse allows the circuit to work only if the fuse rating is equal to the operating current. A fuse should not be used if there is an earth wire connected to the casing of the appliance. A fuse should have a current rating equal to the operating current of the appliance. ( A ) 7. The power rating and the duration of usage of four electrical appliances are summarised in the table below. Appliance Power rating Time used Fan 250 W 6 hours Lamp 100 W 5 hours Rice cooker 2.5 kw 45 minutes Washing machine 3.5 kw 30 minutes Which appliance consumes the most energy? A Fan B Lamp C Rice cooker D Washing machine ( C ) 8. The diagram shows an electrical appliance with a metal casing (indicated by the dotted line) connected to the power supply. Where should a switch be placed? Live wire A B Metal casing represented by the dotted line Neutral wire Earth wire C D ( A ) 2013 Marshall Cavendish International (Singapore) Private Limited 2
3 9. A student draws a circuit, shown below, to show how an appliance should be connected to a fuse and the household mains. Live wire 240 V power supply Neutral wire 3 A 240 V, 550 W Identify the error in the circuit. A The fuse rating is too high. B The fuse rating is too low. C The fuse is connected wrongly. D The switch is connected wrongly. ( C ) 10. Which of the following conditions is not considered a hazard to the user? A Connecting the earth wire to the casing of the appliance B Exposed wires due to damaged insulation C Overloading of appliances in one socket D Using electrical appliances in damp conditions ( A ) 2013 Marshall Cavendish International (Singapore) Private Limited 3
4 Structured Questions (15 marks) 11. Resistors are connected to a 9.0 V d.c. power source as shown in the diagram below. ε = 9.0 V 10 Ω 20 Ω (a) Calculate the current flowing through the 10 Ω and 20 Ω resistors. [1] I = V R = 9 V 30 Ω = 0.3 A [1 m] The current flowing through both resistors is the same, as they are connected in series. (b) Calculate the power dissipated in the 10 Ω and 20 Ω resistors. [2] P 10 = I 2 R = (0.3 A) 2 10 Ω = 0.9 W [1 m] P 20 = (0.3 A) 2 20 Ω = 1.8 W [1 m] 2013 Marshall Cavendish International (Singapore) Private Limited 4
5 (c) In another circuit, two unknown resistors and Y are connected in parallel with the 9.0 V source. ε = 9.0 V 0.6 A 0.3 A Y Calculate the power dissipated by resistors and Y. [2] P = IV = 0.6 A 9.0 V = 5.4 W [1 m] P Y = IV = 0.3 A 9.0 V = 2.7 W [1 m] 12. The cost of a unit (kwh) of electricity is 27 cents. The table shows the daily usage of certain home appliances. Appliance Power rating Time used Electric kettle 200 W 30 min Water heater 800 W 45 min Television 1.5 kw 4 hours (a) Calculate the total energy used in a month in terms of kwh. (Assume there are 30 days in a month.) [4] Energy used by electric kettle = 0.2 kw h 30 days = 3 kwh [1 m] Energy used by water heater = 0.8 kw h 30 days = 18 kwh [1 m] Energy used by television = 1.5 kw 4 h 30 days = 180 kwh [1 m] Total energy = 3 kwh + 18 kwh kwh = 201 kwh [1 m] 2013 Marshall Cavendish International (Singapore) Private Limited 5
6 (b) Calculate the cost of electricity usage at the end of the month. [1] Cost = energy cost per kwh = 201 kwh $0.27 = $54.27 [1 m] 13. (a) An appliance is connected to the live and neutral wires of the a.c. mains supply. Explain what is meant by live and neutral in terms of potential. [2] The live wire connects the appliance to the high voltage mains and is at a high potential. [1 m] The neutral wire completes the circuit by providing a return path to the supply for the current and is always at zero potential. [1 m] (b) A washing machine and a television are connected in parallel to the 230 V mains supply, as shown in the diagram below. Fuse A x Fuse Y 230 V mains supply Washing machine 1.2 kw Television 0.9 kw (i) Suggest a suitable fuse rating for fuse. [2] Using P = IV, Current I flowing through washing machine = 1200 W 230 V = 5.22 A Current I flowing through the television = 900 W 230 V = 3.91 A Total current flowing through fuse = 5.22 A A = 9.13 A [1 m] Suggested fuse rating = 10 A [1 m] B x 2013 Marshall Cavendish International (Singapore) Private Limited 6
7 (ii) State and explain whether fuse Y will blow when points A and B are shorted together. [1] No. When A and B are shorted, current will bypass fuse Y and flow through AB instead. The total resistance in the circuit decreases, resulting in an increase in the current flowing through fuse, which causes it to blow [1 m] Table of Specifications Question no. Type of Syllabus learning Assessment question outcome(s) objectives* No. of marks 1 16(a) K/C (b) K/C (b) A (f) K/C 1 5 Multiplechoice 16(c) A (e), 16(i) K/C (b) A (i) K/C (i) A (d),16(f) K/C (e), 15(f),16(b) A 5 12 Structured 16(c) A (b),16(e), 16(g) K/C/A 5 * K/C: Knowledge/Comprehension A: Application 2013 Marshall Cavendish International (Singapore) Private Limited 7
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