1. Electricity Trashketball Review How to play: 1. One representative from each team will come to the front to compete 2. Both players will answer the question on the whiteboard folder 3. Players with the correct answer will be given a chance to shoot for points. 4. Player will choose to shoot from the 1, 2 or 3 point line. 5. 2. As Emile stood touching the VDG, his hair began to stand on end and spread out. This was most likely due to (a) his hair strands being attracted to the VDG (b) his hair strands being repelled by the VDG (c) his hair strands being attracted to each other (d) his hair strands being repelled by each other 3. Balloon A was rubbed on someones hair. How would balloon A best be described? (a) neutral (b) electrically discharged (c) electron-filled (d) statically charged A B 4. If the negative surface of balloon A is brought near balloon B, what is likely to happen to the charges on balloon B? (a) Negative charges will move away from balloon. (b) Positive charges will move away from balloon. (c) All charges will move away from balloon A. (d) All charges will move toward balloon A. A B 5. The downed power line was part of a circuit that provided electricity to homes. These homes are now without power because (a) Their supply of electrons has run out. (b) Their supply of protons has run out. (c) The flow of current in the circuit has been interrupted. (d) The interruption caused circuit breakers in the homes to trip. 6. A bulb is added to a circuit. When you place your hand near the bulb, it feels warm. The bulb in the circuit would be most accurately identified as a (a) conductor (b) load (c) terminal (d) insulator 7. What is the primary difference between a dry cell and a wet cell? (a) A dry cell is designed for use in dry locations; a wet cell is designed for use in wet locations. (b) A wet cell is much smaller and is commonly found in personal electronic devices. (c) The electrolyte in a dry cell is made of paste; in a wet cell, it is a liquid. (d) Wet cells are very difficult to make; dry cells can be easily made from common materials. 8. In testing a toy with two light bulbs, a student noted that taking out one of the bulbs would cause the other bulb to go out. This is because (a) the bulbs are connected in parallel with each other (b) the bulbs are connected in series with each other (c) the circuit draws too much current when a bulb is disconnected (d) the batteries in the toy had lost their charge 9. A battery supplies 6.0 V to a circuit containing a single light bulb. There are 0.40 A flowing in the circuit. What is the resistance of the bulb? (a) 0.4 (b) 2.4 (c) 6.0 (d) 15 10. Which of the following is the equivalent of two 30- resistors in series? (a) 15 (b) 30 (c) 60 (d) 900 11. Students measure a 12 V potential difference across a 9.0- resistor in a circuit. What is the current flowing through the resistor? (a) 0.75 A (b) 1.3 A (c) 9.0 A (d) 12 A 12. What is the voltage drop across a 270- resistor that has a current of 0.30 A flowing through it? (a) 6.0 V (b) 9.0 V (c) 36 V (d) 81 V 13. If an object is repelled by a negatively charged substance, the object has/is a) positive charge b) opposite charge c) neutral d) negative charge e) impossible to say what charge is on the object 14. Which statement correctly describes an atom? a) electrons orbit around the protons and neutrons b) protons orbit around the electrons and neutrons c) neutrons orbit around the protons and electrons d) electrons, neutrons and protons are mixed together e) protons occupy energy levels around a negative nucleus 15. An object that does not conduct electric charges is called a a) conductor b) electrolyte c) semiconductor d) electrode e) insulator 16. The amount of current flowing through a circuit is measured in: a) volts b) watts c)ohms d) amps e) electrons 17. What type of meter measures only potential difference? a) voltmeter b) ammeter c) galvanometer d) multimeter e) ohmmeter 18. I. Circuit A is a parallel circuit II. Circuit B is a series circuit III. Disconnecting one bulb in A will force all light bulbs to go dark IV. If the battery in B has a potential difference of 9 volts, all bulbs also have a potential difference of 9 volts. Which of the following are true? a) I only b) III , IV only c) I, II only d) None of them e) All of them 19. The load in an electric circuit A. is the source of electric energy B. can turn the circuit on or off by closing or opening the circuit C.is the wire through which electric current flows D.transforms electrical energy into other forms of energy 20. Two light bulbs are connected in parallel to a source of constant voltage. If one of the bulbs is unscrewed, the voltage across the other bulb will A.double B.halve C.remain the same D.become zero 21. How many volts does a 1000 watt toaster need if it draws 10 A of current? A. 10000 watts B. 100 volts C. 10 volts D. 10000 volts 22. A lemon will produce voltage. A. True B. False 23. A current of electrons will best move through A. plastic B. glass C. metal D. rubber 24. Which device would you use to measure the current in an electric circuit? A. voltmeter B. ammeter C. ohmmeter D. resistor 25. When electricity is conducted in a wire, the particles that actually move along the wire are: A. neutrons B. protons C. electrons D. atoms 26. An appliance has a power rating of 4.8 kW. If electricity costs $0.065 per kWh, how much does it cost to leave the appliance operating for 4.5 hours? A. $0.312 B. $1.40 C. $69.33 D. $312.00 27. Which statement best describes the use of an electroscope? (a) The display on the electroscope is read to determine the charge in coulombs. (b) The movements of the leaves of the electroscope are used to determine the sign and relative magnitude of the charge. (c) The electroscope can be used to distinguish between an object charged by contact and one charged by induction. (d) The electroscope leaves show the current flow in the circuit. 28. How is an ammeter supposed to be wired into a circuit? A. In parallel B. In series C. It doesnt matter either way will provide an accurate reading D. Across the battery 29. Which of the following is the best estimate of the energy used by a 0.1 kW light bulb that is used to light a porch 12 hours per night for 30 days? A. 3.6 kWh B. 36 kWh C. 120 kWh D. 1.2 kWh 30. The current drawn by a kettle is 12 A and is plugged into a 120 V outlet. What is the resistance of the heating element in the kettle? A. 0.10 B. 1200 C. 12 D. 10 E. 1440 31. What current is needed to operate a device that has a resistance of 24 if the source has a voltage of 120 V? A. 2880 A B. 0.20 A C. 5.0 A D. 10 A 32. The filament of a light bulb has a resistance of 240 . If it requires a current of 5 A to operate at full brightness, what voltage must be applied to the light bulb? A. 120 V B. 480 V C. 240 V D. 1200 V 33. If a 0.2 kW light is on for 15 hours, how many kWh of energy does it use? A. 3000 kWh B. 3 kWh C. 3,000,000 kWh D. 10,800,000 watt seconds 34. Which of the EnerGuide labels below indicates the highest cost of operation? 35. If 0.2 A is flowing in a circuit with a light bulb and a 1.5 V battery, what is the resistance of the light bulb? A. 0.3 B. 0.75 C. 3 D. 7.5 36. How much power does a kettle use that draws 4 amperes at 120 volts? A. 30 watts B. 30 ohms C. 480 watts D. 480 joules 37. A 120 V appliance draws 20 A of current. How much electrical energy does the appliance use in 120 minutes? A. 2 400 J B. 4 800 J C. 288 000 J D. 17 280 000 J