# Unit 3 BLM Answers UNIT 3 BLM 3-46

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1 UNIT 3 BLM 3-46 Unit 3 BLM Answers BLM 3-3, Charge Transfer Diagrams 1. Positively charged objects should have more (+) than ( ). Negatively charged objects should have more ( ) than (+). 2. They must be equal. 3. (a) Diagrams should show 15 (+) and fewer than 15 ( ). (b) The number of positive charges is the same. (c) The number of negative charges is less. 4. (a) Diagrams should show 15 (+) and more than 15 ( ). (b) The number of positive charges is the same. (c) The number of negative charges is more. BLM 3-5, Obeying the Laws of Static Charge 1. negative 2. attracts 3. attracts 4. positive, neutral 5. repels 6. Diagrams should show the negative and neutral charges attracted to the object on the table, and the positive charged repelled by the object. 7. (a) decreased (b) increased (c) increased (d) decreased BLM 3-6, Conduction/Induction Venn Diagram Students answers may vary, but should include the points: both are methods of charging objects; when charging by conduction, electrons transfer from one object to another; and when charging by induction, the electrons are rearranged in the object but no electrons actually transfer from one object to another. BLM 3-7, Conduction/Induction Charge Diagrams 1. In induction, the electrons relocate within the object but do not transfer from one object to the other. In conduction, electrons physically transfer from one object to the other. 2. (a) (d) In all four diagrams, the number and placement of the (+) signs should remain the same. (a) Equal number of (+) and ( ). The ( ) should be grouped toward the left side of the object. (b) Some of the ( ) should be transferred to the rod. (c) Some more ( ) should be added to the object. (d) Equal number of (+) and ( ). The ( ) should be grouped toward the right side of the object. 3. Conduction: diagrams (b) and (c). Induction: diagrams (a) and (d).

2 BLM 3-8, Forces and Electrical Charges 1. Human body Air Wood Rubber Plastic Aluminum Silver Wool Copper Iron Fur Conductor Insulator 2. (a) opposite (b) negative, positive (c) opposite (d) positively (e) negatively 3. (a) positive (+) (b) positive (+) (c) negative ( ) BLM 3-9, Pop Can Race For this activity, there are no right and wrong solutions to the problem, only more and less effective solutions. The groups that try a variety of strategies should discover that the plastic golf tubes, when rubbed vigorously with plastic (clear plastic oven-roasting bags are best for this) will produce the greatest charge and hold the charge for the longest time. BLM 3-11, Chapter 7 Quiz 1. C 2. D 3. B 4. C 5. A 6. C 7. B 8. C 9. A 10. B 11. F 12. C 13. G 14. A 15. D 16. B 17. (a) The force increases. (b) The force decreases. (c) The force decreases.

3 18. The number and position of (+) signs should remain the same in both (a) and (b). (a) The electrons in the object should be grouped toward the right side. (b) Some of the electrons from the object should have transferred to the rod. 19. Rub the acetate with a paper towel so that the acetate becomes negatively charged. Bring the charged acetate near the Styrofoam chips. If the chips repel, then the chips are negatively charged. If the chips attract, then the chips are positively charged. BLM 3-13, Making Light Bulbs Glow 1. Bulb attached to only one terminal. Attach side of the bulb s base to positive terminal. 2. Bulb attached to only one terminal. Remove wire from positive terminal and attach it to side of bulb s base. 3. Both terminals on bulb attached to positive terminal of battery. Remove wire connecting base of bulb (not the side of the base) to positive terminal and touch base of bulb to negative terminal. 4. Bulb attached to only one terminal. Attach side of bulb s base to the negative terminal. 5. Bulb attached to only one terminal. Attach bulb s base (not side of base) to negative terminal. 6. Both terminals on bulb are attached to same battery terminal. Move wire to side of bulb. Touch base of bulb to terminal. 7. Bulb not attached to either terminal of battery. Touch base of bulb to positive terminal and touch wire to negative terminal. 8. Bulb attached to only one terminal of battery. Attach base of bulb (not side of base) to positive terminal of battery. BLM 3-14, Make Your Own Dimmer Switch 1. Answers may vary. The following shows one successful design. 2. Move the wire back and forth along the lead.

4 BLM 3-15, Drawing Circuit Diagrams 1. (a) closed (b) battery, light bulb 2. (a) open (b) n/a 3. (a) closed (b) battery, light bulbs

5 BLM 3-16, Circuit Symbols 9. Answers may vary slightly. Sample answers: (a) source: the source of electrical energy (b) conductor: the wire through which electric current flows (c) load: a device that transforms electrical energy into other forms of energy (d) switch: a device that can turn the circuit on or off by closing or opening the circuit BLM 3-17, Calculate the Current 1. I 2 = 6.0 A 2. I 3 = 4.0 A 3. I 2 = 6.0 A I 3 = 6.0 A I 5 = 2.0 A BLM 3-18, Calculate the Potential Difference 1. V 1 = 35 V 2. V S = 110 V 3. V 1 = 9.0 V BLM 3-21, Ohm s Law Ω A V A V Ω 7. (a) 5.0 A (b) 2.5 A V BLM 3-22, Resistor Colour Code 1. (a) 6500 Ω (b) Ω (c) 560 Ω (d) 12 Ω (e) Ω (f) 2100 Ω 2. (a) 230 Ω (b) red, orange, brown

6 3. (a) 6400 Ω (b) blue, yellow, red BLM 3-23, Practising Calculating Resistance 1. R = 3600 Ω or Ω 2. I = 0.48 A or A 3. V = 9.0 V 4. I = 18.3 A or A Ω Ω Ω or Ω A or A A A or 0.04 A or 0.04 ma V or V BLM 3-24, Electricity Crossword Puzzle Across 2. ohm 5. volt 6. ampere 8. ammeter 10. voltmeter 15. potential difference Down 1. coulomb 3. circuit 4. watt 7. battery 9. electric circuit 11. power 12. switch 13. load 14. resistance BLM 3-27, Chapter 8 Quiz 1. C 2. B 3. D 4. A 5. D 6. A 7. C 8. C 9. C 10. D 11. D 12. B 13. A 14. G 15. E 16. C

7 (a) 30 Ω (b) A, 6.4 ma 19. Connect the battery to the resistor using the connecting wires. Using an ammeter and the voltmeter, measure the current through the resistor and the voltage across the resistor. Calculate the resistance using Ohm s law (R = V/I). BLM 3-28, Series Circuits 1. only one 2. equal to 3. different from 4. increases 5. equal to 6. Voltage = 10 V, current = 3.0 A 7. Voltage = 12 V, current = 4.0 A BLM 3-29, Parallel Circuits 1. more than one 2. different from 3. equal to 4. decreases 5. equal to 6. Voltage = 12 V, current = 6.0 A 7. Voltage = 90 V, current = 1.0 A

8 BLM 3-30, Designing Circuits

9 BLM 3-31, Drawing Series and Parallel Circuit Diagrams BLM 3-32, Understanding Circuit Diagrams 1. (a) Current flows through whole circuit. (b) Current flow stops at the second bulb because circuit is interrupted. (c) Current flows through rest of circuit, bypassing fifth bulb. 2. V 1 = 7.5 V; R 1 = 5.0 Ω; R 2 = 3.0 Ω 3. V 1 = 40 V; R 1 = 2.0 Ω; V 2 = 40 V BLM 3-33, Calculate Voltage and Current 1. V 2 = 6.0 V; V 4 = 2.0 V 2. I S = 20 A; I 5 = 14 A BLM 3-38, Electrical Power and Energy W A V A 5. (a) 53 V (b) 1.9 A W J J J BLM 3-39, Power Problems W or W W or W

10 W or W 4. (a) 150 W or W (b) 45 kj or J BLM 3-40, The Price of Energy 1. \$ \$ \$ \$4.22 BLM 3-43, Chapter 9 Quiz 1. C 2. C 3. B 4. C 5. D 6. B 7. C 8. B 9. B 10. A 11. G 12. E 13. A 14. B 15. D 16. F 17. The second bulb stays lit. This is because there still is a complete circuit through the second bulb and battery. Current will still be able to travel through the second bulb. 18. (a) (i) J; (ii) 0.35 kw h (b) \$ (a) 3.0 A (b) 6.0 V (c) 18 W BLM 3-44, Unit 3 Test 1. C 2. B 3. C 4. D 5. D 6. A 7. C 8. B 9. B 10. C 11. J 12. H 13. C 14. I 15. D 16. K

11 17. A 18. G 19. B 20. E 21. Neutral should show equal number of (+) and ( ); negative should show more ( ) than (+); and positive should show more (+) than ( ). 22. (a) An insulator does not allow electrons to move freely. A conductor allows electrons to move freely. (b) Students answers may vary but could include plastic or glass for insulator, and any type of metal for conductor. 23. In conduction, electrons transfer from one object to the other. When charging by induction, the electrons relocate within the material but do not transfer from one object to the other. 24. (a) increases (b) decreases (c) increases 25. A charged object will attract both an oppositely charged object and a neutral object. A like-charged object would repel and the neutral object would still attract (a) 20 Ω (b) 5.0 ma (c) (i) 1000 Ω; (ii) 20 V 28. (a) Parallel (b) Voltage = 6.0 V, current = 2.0 A 29. (a) Series (b) Voltage = 4.0 V, current = 2.0 A 30. (a) 1.5 A (b) 2.2 kw h (c) \$0.15

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