1. Electricity & Magnetism Chapter 19 and 20 Review for Test April 19, 2005

2. Question 1 What are the units for resistance? A. volts B. ohms C. amps D. watts E. meters

3. Question 2 A circuit has 120 volts and a current of 10 amps. What is the resistance? A. 1200 ohms B. 0.083 ohms C. 1200 volts D. 12 ohms E. 12 amps

4. Question 3 In a schematic diagram, what does this symbol represent? A. Power Source B. Wire C. Light Bulb D. Ammeter E. Voltmeter

5. Question 4 In a schematic diagram, this represents a power source. Which side is the positive terminal? A. Left B. Bottom C. Right D. Top E. None

6. Question 5 Describe a circuit that has a high current and a low voltage in terms of electrons and energy. A. Few electrons, high energy B. Few electrons, low energy C. Many electrons, high energy D. 18 electrons, high energy E. Many electrons, low energy

7. Question 6 What is the voltage in a circuit that has 10 amps of current and 5 ohms of resistance? A. 10 volts B. 50 amps C. 2 volts D. 50 volts E. 15 volts

8. Question 7 The force of attraction between two charges gets smaller as the two charges move farther apart. What law is this? A. Coulomb’s Law B. Newton’s First Law C. Kinetic Theory of Matter D. Ohm’s Law E. Cole’s Law

9. Question 8 What type of circuit has only one path for electrons to flow? A. Alternating Current B. Open Circuit C. Series Circuit D. Parallel Circuit E. Combination Circuit

10. Question 9 Which of the following materials is a good conductor? A. Wood B. Paper C. Glass D. Copper E. Plastic

11. Question 10 A resistor slows down the flow of electrons. What does this create? A. Bunnies B. Homework C. Music D. Air E. Heat

12. Question 11 Which two light bulbs are connected in series? A. P and E B. H and G C. G and P D. C and L E. P and H

13. Question 12 How many lights go out when the switch at J is open? A. 0 (none) B. 1 C. 2 D. 3 E. 5 (all)

14. Question 13 Which way is electricity moving? A. From B to D B. From I to F C. From N to K D. From D to B E. From K to I

15. Question 14 If Light G goes out, what happens? A. E & H stay on, C & P go out B. All other lights stay on C. H, C, and P stay on, E goes out D. All other lights go out E. E & H go out, C & P stay on

16. Question 15 Where can you put a switch that would control the whole circuit? A. Between G and H B. Between P and K C. Between B and C D. Between D and E E. Switch J already does this

17. Question 16 What is “L”? A. Ammeter B. Resistor C. Light Bulb D. Power Source E. Voltmeter

18. Question 17 Which light should be the brightest? A. G B. B C. H D. P E. E

19. Question 18 If Light P was replaced with a voltmeter, would it work properly? Why? A. Yes, because it’s in parallel B. Yes, because it’s in series C. No, because it’s in parallel D. No, because it’s in series E. It depends on the battery

20. Question 19 If Light C was replaced with an ammeter, would it work properly? Why? A. Yes, because it’s in parallel B. Yes, because it’s in series C. No, because it’s in parallel D. No, because it’s in series E. It depends on the battery

21. Question 20 If each bulb has 10 ohms of resistance, what is the total resistance from D  F  I  K ? A. 10 ohms B. 20 ohms C. 30 ohms D. 40 ohms E. 50 ohms

22. Question 21 How much current is passing through a radio carrying 120 volts with a resistance of 240 ohms? A. 0.5 amps B. 1 amp C. 2 amps D. 10 amps E. 28 800 amps

23. Question 22 A circuit is carrying 9 amps of current and has 10 deciohms of resistance. What is the voltage in the circuit? A. 90 amps B. 9 amps C. 0.9 volts D. 9 volts E. 90 volts

24. Question 23 Which of the following is a property of matter? A. Magnetism B. Electrical Power C. Amp D. Compass E. Parallel Circuit

25. Question 24 Which device converts electrical energy into mechanical energy? A. Static Electricity B. Electric Motor C. Superconductor D. Generator E. Maglev

26. Question 25 Which device changes the amount of voltage in a circuit? A. Compass B. Electric Motor C. Superconductor D. Generator E. Transformer

27. Question 26 Which device aligns with the Earth’s magnetic field? A. Compass B. Electric Motor C. Superconductor D. Generator E. Transformer

28. Question 27 An atom becomes positively charged when it ____________ A. Gains Protons B. Loses Protons C. Gains Electrons D. Loses Electrons E. Loses Neutrons

29. Question 28 Which of the following wires would have the least resistance? A. Short and Thin B. Long and Thin C. Short and Thick D. Long and Thick E. Red and Blue

30. Question 29 How do you create static electricity? A. Rub two conductors together B. Rub two insulators together C. Attach a battery to a circuit D. Plug it in E. Rub an insulator on a conductor

31. Question 30 What is Ohm’s Law? A. When the bell rings and you go “ohm”. B. F = m x a C. v = λ x f D. D = m / V E. V = I x R