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____ 38 ELECTRICITY - CHAPTER 1 QUIZ KEY NAME: PART 1 - FILL IN THE BLANKS (1 MARK EACH) /26 1. 2. 3. 4. An electric - field is an area over which an electric charge exerts a force. A force of attraction exists between oppositely charged particles. A force of repulsion exists between similarly charged particles. In conduction, there is direct contact of objects and electrons flow through one object to another. 5. Materials that do not allow electric charges to flow freely are called insulators. 6. Rubbing two objects together to charge an object is called friction. 7. Static electricity is the buildup of electric charges in an object. 8. The loss of static electricity is called electric - discharge. 9. In a lightning storm, the bottom of the cloud is negatively charged and the top is positively charged. 10. Lightning - rods provide a safe path for lightning directly into the ground. 11. An electroscope has uncharged metal leaves hanging straight down. 12. A thermocouple produces electrical energy from heat energy. 13. A photocell produces electrical energy from light energy. 14. In an electrochemical cell, the difference in charges between the positive and negative terminals is called the potential – difference. 15. A circuit is a complete path for electrons to travel. 16. Potential difference can often be described as voltage. 17. Opposition to the flow of electric charge is called resistance. 18. Current that always flows in the same direction is called direct current. 19. Current that reverses direction regularly is called alternating current. 20. Ohm’s - law identifies a relationship among current, voltage, and resistance. WORD BANK (words may be used more then once or not at all) Ohm’s law Circuit breaker Parallel Attraction Induction Lightning rods Potential difference power fuses series repulsion insulators positively indirect voltage circuit alternating electric field static negatively current open direct friction electric discharge photocell watts closed resistance conduction electroscope thermocouple PART 2 - CALCULATIONS (1 MARK EACH) /10 21. 22. 23. 24. 25. I (current) 0.16 15 5.5 0.24 5 V (volts) 12 240 110 6 110 R (resistance) 75 16 20 25 22 26. 27. 28. 29. 30. P (power) 900 15 5.5 150 5 V (voltage) 12 240 0.275 6 110 I (current) 75 0.0625 20 25 0.045 PART 3 – DIAGRAM AND LABEL (3 MARKS EACH) 31. Parallel circuit – 32. Closed circuit – 33. Open circuit – 34. Series circuit – /12