Electric Charges Study Sheet

Name:_______________

Date:__________

1. All matter is composed of ______.

2. Atoms have a nucleus composed of _______ and ________.

3. Protons have a ________ electrical charge.

4. In orbitals surrounding the nucleus of an atom are found particles called ________.

5. Electrons have a ________ electrical charge.

6. Matter which has more protons than electrons is __________ charged.

7. Matter which has more electrons than protons is __________ charged.

8. Matter which has an equal number of protons and electrons is electrically _______.

9. Matter having opposite electrical charges will _______ to each other.

10. Matter having the same electrical charges will _____ each other.

11. When you rub one object against another, only the ________ are free to move from one object to the other.

12. Electrons can produce ______.

13. ___________ is defined as the energy associated with electrons.

14. A build up of electrons on an object is called ______ electricity.

15. The three ways that objects can become charged with static electricity are _________, __________ and _________.

16. ________ involves rubbing electrons off of one object on to another.

17. __________ is charging by direct contact with an object.

18. In __________, electrons flow through one object to another object.

19. Material though which electrons can easily move are called __________.

20. ______ are usually good conductors.

21. List four metals which are used as electrical conduction wires.

a. ______ b. ________ c. _______ d. _________

22. Materials through which electrons cannot move are called __________.

23. List four materials which are good insulators.

a. __________ b. __________ c. __________ d. __________

24. _________ is a method of charging an object with static electricity that involves the rearrangement of electric charges.

25. Induction is unlike conduction in that the objects do not touch each other.

26. If one object is negatively charged and is placed near another object, it will cause the electrons on that other object to be ________.

27. If an object which is positively charged is placed near another object, it will cause the electrons of that object to be _________ to it.

28. _________ is static electricity which occurs because of induction.

29. In a thunder cloud, the moisture rubs electrons from the matter which composes the atmosphere removing _________ from this matter.

30. In a thunder cloud, the ______ of the cloud is negatively charged and the ___ is positively charged.

31. A lightning bolt is an electrical discharge between the ___ and the ______ of a cloud, or between the ______ of one cloud and the ___ of another.

32. The electrons on earth are ________ by the negatively charged bottom of a thunder cloud. Therefore, a discharge can occur between the _____ and the ______ of a cloud.

33. The heat of a lightning bolt heats the air causing it to ______ rapidly, producing the sound of _______.

34. _________ _______ hypothesized that a lightning bolt will tend to hit the _______ object on earth.

35. Benjamin Franklin invented the first _________ ___.

36. Franklin discovered that the positively charged earth and the negatively charged thunder cloud will connect better if you have a ______ _______ conductor placed on the earth.

37. _________ ____ are sharp pointed conductors placed above a building and ________ to the earth.

38. ________ _______ is electrons flowing along a conductor.

39. ________ _______ is measured according to how many electrons pass a given point in a second.

40. The metric unit for measuring electric current is the ______ or ___.

41. The opposition to the flow of electrons is called __________.

42. The metric unit for resistance is the ___.

43. The thicker the conductor, the ____ resistance.

44. The longer the conductor, the _______ the resistance.

45. Resistance to the flow of electrons produces ____.

46. The measure of the energy available to push electrons along a conductor is called _______.

Electric Charges
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