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Name: _________________________ NOTE-TAKING WORKSHEET

ELECTRICITY & MAGNETISM 1

1. The word ____________________ is used to describe a variety of phenomena resulting from the presence and flow of electric charge. 2. Examples of electrical phenomenon include: _________________________________________ _____________________________________________________________________________ In scientific work different terms are used to describe these related (but different) phenomena. 3. Electric charge: _______________________________________________________________ ____________________________________________________________________________ 4. The common subatomic particle with a negative charge is the ____________________. 5. The common subatomic particle with a positive charge is the ____________________. 6. Electrical charges are usually due to objects having an gained or lost __________________. 7. _____________________ is usually caused when dissimilar materials are rubbed together, transferring electrons from one to the other. developing an electric charge. 8. Electric charges on objects are either positive or negative. Objects with excess electrons have _______________ charges whereas objects which have lost electrons have _______________ charges. 9. Objects with electric charges exert forces on other charged objects. Objects with the same electric charges (attract / repel) each other. 10. Objects with different (opposite) electric charges (attract / repel) each other. 11. Electric charges are measured in ____________________. 12. One electron has a _____________________ of

1.602×10

-19

This transfer of electrons results in the objects

Coulombs.

13. ___________________ is the flow of electric charge. of electrons.

Usually we are referring to the movement

14. Electrical current is measured in __________________ commonly abbreviated __________which have the symbol _____. 15. Substances which allows the (easy) movement of electrons are called ____________________. 16. Substances which prevent the flow of electrical current are called ____________________. There are no materials which perfectly prevent the flow of electrical current.

Name: _________________________

ELECTRICITY & MAGNETISM 2

17. Virtually all substances ____________________ the flow of electrical current to some degree. 18. Electrical ___________________ is the tendency of a substance to resist the flow of electrons (or electric current). 19. Electrical resistance is measured in ________________ which have the symbol _____. 20. ___________________ is the "push" behind electric current. 21. One ____________________ is defined as the ability to do __________________ of work on ____________________ of electric charge. 22. Electrical potential is measured in __________________ which have the symbol _____. 23. Ohm's Law is a mathematical equation which relates ____________________, ____________________, and ______________________. 24. Ohm's Law can be written:

25. Where: The variable V I R represents and is measured in:

Solve these problems using Ohm's Law 26. If a 6 V battery is connected to a light bulb whose resistance is 55,000 how much current will flow in the circuit?

27. A certain electric heater is rated for 120 V and a current of 10 A. What must be the minimum resistance of the heating element?

28. If I wanted to make a 10A current flow through a 250 resistor what voltage should I apply?

Name: _________________________ Electrical Power

ELECTRICITY & MAGNETISM 3

29. In science ____________________ is defined as the rate at which ________________ changes from one form to another. 30. Electrical power is measured in ________________ which have the symbol _____. 31. Electrical power is related to current and voltage by the equation:

32. Where: The variable P I V Try these problems related to electrical power: 33. How much current is used by a 25 W light bulb (120 V)? represents and is measured in:

34. A vacuum cleaner's motor is rated for 9 Amps and 120 V. What is the power of the motor in Watts?

35. Which consumes more power a 24 V motor at 9 A or a 120 V motor at 5 A?

Electric Circuits 36. A(n) ____________________ is a path for electricity to flow through. 37. A circuit is said to be ____________________ if electricity can flow through it and ____________________ if electricity can not flow. 38. Please provide a the name of the electrical component represented by these symbols:

39. __________________

40. __________________

41. __________________

Name: _________________________

ELECTRICITY & MAGNETISM 4

CIRCUIT A

+

CIRCUIT B

+

CIRCUIT C

+

For the following questions consider circuits A, B, and C: 42. The circuit labeled A is (open / closed), this means that electrical current (can / can not) travel around the circuit. 43. ____________________ circuits which allow only one path for electricity to follow. 44. ____________________ circuits which allow multiple paths for electricity to follow. 45. Consider circuit B, are the two light bulbs arranged in series or in parallel? _________________ 46. If one of the light bulbs in circuit A is removed, the other light bulb (will / will not) continue to glow. 47. By comparison to circuit B, the light bulbs in circuit C are arranged in _____________________. 48. This means that if one of the light bulbs in circuit C is removed the other light bulb (will / will not) continue to glow. For the following questions consider circuits D and E: 49. In which circuit are the batteries arranged in series? ______ 50. In which circuit are the batteries arranged in parallel? ______ 51. In which circuit will the light bulb glow most brightly? ______ 52. Which circuits on this page allow multiple paths for electricity to flow? ___________________. 53. Which of the circuits on this page allow only one path for electricity to flow? ___________________.

-

CIRCUIT D

+

-

+

CIRCUIT E

+

+

Name: _________________________ MAGNETISM

ELECTRICITY & MAGNETISM 5

54. A ____________________ is a material or object that produces a magnetic field. 55. A magnetic field exerts a force on ___________________ or ____________________. 56. Magnetic fields are always ____________________. Which means that they have two opposite poles. 57. A common way to detect magnetic fields is with a magnetic compass. A magnetic compass consists of a ____________________ which is free to pivot (spin) and tends to line up with magnetic fields. 58. Magnetic poles are usually labeled ____________________ and ____________________. The end of a compass needle that points north is the "north" magnetic pole of the needle. Laboratory magnets are labeled the same way. The north end of a magnet is attracted (weakly) to a spot near the geographic north pole of the earth. 59. Since magnetic dipoles line up "head to tail" (to minimize their magnetic potential energy) the north pole of one magnet is attracted to the ____________________ pole of another magnet. 60. The end of a compass needle that points to the magnetic pole located at the Earth's geographic north (where Santa Claus and Eskimos live, but not penguins) actually points to the ____________________ pole on a laboratory bar magnet like we use in class. 61. Breaking a magnet in half (does / does not) separate the poles and produces ________________ ______________________________________________________________________________. 62. A ____________________ magnet is one that stays magnetized. 63. A ____________________ magnet is one that loses its memory of previous magnetizations. 64. An ____________________ behaves like a magnet when an electric current flows through it. The simplest ____________________ is a single current carrying wire. 65. The strength of electromagnets can be increased (hundreds or thousands of times) by wrapping the wire around ____________________ (sometimes called "soft" magnetic materials). 66. The electromagnet can be made stronger by increasing either the _______________ flowing through the wire or by increasing the _________________________ of the wire.

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