1. Electricity Review

2. True or False
The space around a charged particle through which its electric charge can exert force is called the charge space

3. false
Electric field

4. True or False
Because protons have like charges, they repel each other

5. True

6. A buildup of electric charge on a sock in a clothes dryer is an example of a field charge

7. False
Static charge

8. An uncharged glass rod touches an uncharged balloon
An uncharged glass rod touches an uncharged balloon. Electrons move from the rod to the balloon. Now both objects have a charge. This is an example of charging by contact.

9. True

10. The buildup of a charge without direct contact is conduction

11. False
Induction

12. A photocopier uses static electricity to produce copies

13. True

14. An atom can be best describe as a
Unit of measurement
Mixture of different substance
Very small unit of matter
Short amount of time

15. c

16. Electrons are particles that have
Balanced charges
No charge
Positive charges
Negative charges

17. d

18. Neutrons and protons are atomic particles that have very different
Sizes
Masses
Speeds
charges

19. d

20. When clothes coming out of the dryer stick together, it is because they
are not clean yet
Have become electrically charged
Have become magnetic
Are too hot to touch

21. Which of the following is an example of static charges that build up through CONTACT?
a) rubber soles on wool carpet
b) the ground below a storm cloud
c) a doorknob near someone’s hand
d) hair near a charged balloon

22. a

23. Which of these is an example of charging by INDUCTION?
A polyester shirt sticking to a person’s jacket
Wool slippers being wiped on a rubber mat
Lighting striking a lighting rod
A negatively charged glass rod held near a balloon

24. d

25. When an electrical charge moves from a higher potential energy to a lower potential energy a) the potential energy of the charge is converted to kinetic energy b) potential energy of the charge is converted to nuclear energy c) the potential energy of the charge increases d) kinetic energy of the charge decreases

26. a

27. Lightning strikes a lightning rod instead of a house because
The rod is positively charged when there is no storm
The rod is negatively charged when there is no storm
The house has a lower resistance than the rod
The rod has a lower resistance than the house

28. d

29. Wire made of a material with low resistance might be used in a
Light bulb
Stove burner
Power line
toaster

30. c

31. Two particles have the same electric charge
Two particles have the same electric charge. What will happen if these particles come into contact?
They will attract each other
They will repel each other
They will cancel each other’s electric field
They will create an electric field

32. b

33. An object with no net charge will become charged when it touches another neutral object that
Gives up electrons
Remains neutral
Becomes polarized
Is made of copper

34. a

35. What kind of energy does an object have because you are holding it up in the air?
Kinetic energy
Potential energy
Electromagnetic energy
Static electricity

36. b

37. If you feel a small shock when you touch a metal doorknob, it is because of
Nuclear power
Static electricity
Chemical energy
lightning

38. b

39. Two objects are touching
Two objects are touching. How is heat transferred from one object to another?
Convection
Conduction
Radiation
isulation

40. b

41. Before a flash of lightning, a positive charge builds up on the grounds surface through
Induction
Conduction
Insulation
Contact charging

42. a

43. An electric current is a flow of
Charge
Resistance
Conduction
Insulation

44. a

45. Suppose you walk across a carpet. You touch an object and get a shock
Suppose you walk across a carpet. You touch an object and get a shock. Theobject you touched is most likely a(n)
Electric cell
Dry cell
Insulator
conductor

46. d

47. What has happened to a “dead” household battery?
The current through the cell has reversed
The cell has change from a wet cell to a dry cell
The chemical reactions inside the cell have stopped
Electrolytes reduced the flow of electrons in the cell.

48. c

49. Which of the following describes an electric field
Which of the following describes an electric field? a) the increase in positive charges around a particle b) the area around a charge in which an electrical force can be exerted c) the pattern that neutral charges make in a proton or electron d) the area around a charge that attracts or repels neutral charges.

50. b