Unit 8

Question 1

42. Charges can act at a distance by exerting an _________ .

Answer 1

42. Electric field

U8/C1 (pg. 3)

Question 2

43. Explain how lightning is created. Include which type of electric charge transfer it is.

Answer 2

43. Movement of clouds and air currents causes a buildup of static electricity
    in clouds. When e- buildup becomes great enough, a positive charge is induced on
    Earth. Eventually attraction is so great that the e- travel from clouds to Earth to neutralize the charge imbalance.

U8/C1 (pg. 5)

Question 3

44. How does a battery work?

Answer 3

44. Chemical reactions provide a voltage difference between the (+) and (-) terminals of the battery. When the terminals are connected, an electrical current pushes through the conductor/wire because of the voltage difference. e- flow from the (-) end to the (+) end.

U8/C2 (pg. 7)

Question 4

45. List the four factors that affect resistance in a wire.

Answer 4

1. Material
2. Size
3. Length
4. Temperature

U8/C2 (pg. 8)

Question 5

47. Draw a parallel circuit with one battery, four lamps, switches to turn each lamp off and a switch to turn the whole circuit off.

Answer 5

47. I had one line in the circuit. And I was supposed to have four.

U8/C3 (pg. 13)

Question 6

49. List two differences between series circuit and parallel circuits and list a real world example of each.

Answer 6

49. A series circuit has 1 path and all must work at once. An example is flashlight. A parallel circuit has more than one path and can use one part at a time. An example of it is a house.

U8/C3 (pg. 12)

Question 7

49. Find the total resistance and the current in the circuit below.

Answer 7

49. I forgot to find the current of series circuit.

U8/C3 (pg. 15)

Question 8

50. Find the total resistance and the voltage if the circuit has a current of 40 amps flowing through it.

Answer 8

50. I forgot to find the voltage.

U8/C3 (pg. 15)

Question 9

51. Explain two ways we discussed to keep a house from overheating.

Answer 9

51. Initial breaker: piece of metal that bends overheated circuits.

U8/C3 (pg. 14)

Question 10

52. Describe what an electromagnet is and list the two ways to increase its strength.

Answer 10

52. temporary magnet made by placing a piece of iron inside a current carrying coil of wire.
53. The more loops of wire, the stronger the magnetic field.
54. The stronger the current, the stronger the magnetic field.

U8/C4 (pg. 26)

Question 11

53. Explain ferromagnetism. Make sure to include why is happening to the electrons in the atoms. You may draw a picture if that helps.

Answer 11

53. Phenomenon where objects placed in a strong magnetic field become magnetized due to the poles within their atoms aligning (all e- in same direction).

U8/C4 (pg. 25)

Question 12

Providing a path that allows electric charges to travel directly into the Earth rather than traveling through a building.

Answer 12

Grounding

U8/C1 (pg. 5)

Question 13

Negatively charged particles in an atom

Answer 13

Electrons

U8/C1 (pg. 3)

Question 14

Electric charges always flow from ______ areas to _____ areas.

Answer 14

negative, positive

U8/C1 (pg. 3)

Question 15

In a closed circuit containing one resistor and a battery, if the voltage in the battery increases, the current going through the resistor increases. Why does this occur?

Answer 15

As the electrons are pushed more by the battery, they move faster through the circuit.

U8/C3 (pg. 12)

Question 16

Which of the following statements about electric charge is true?

Answer 16

Electrical forces act at a distance.

U8/C1 (pg. 3)

Question 17

This exerts a force that causes other electric charges to move.

Answer 17

electrical fields

U8/C1 (pg. 3)

Question 18

Particles in the atom that have no charge

Answer 18

Neutrons

U8/C1 (pg. 3)