Test- Unit 8 Electricity and Magnetism

Question 1

42. Charges can act at a distance by exerting a(n) ________ which is an example of ________.

Answer 1

electric field, induction

U8 C1 pg 4

Question 2

43. Explain how lightening is created. Include which type of transfer it is.

Answer 2

Moving clouds create a build up of static electricity. Charge becomes so great it induces a positive charge on ground. Attraction eventually becomes so strong e- travel to earth (in the bolt) to neutralize.
U8 C1 pg5

Question 3

48. List two different ways between series and parallel circuits AND lost a real-world example of each.

Answer 3

Series- one path way electrons flow
Series- voltage decreases as it travel through the circuit
Parallel- multiple path ways electrons flow through
Parallel- voltage stays the same throughout
Series: house
Parallel- ceiling lights in MA Classroom
U8 C3 pg 12

Question 4

52. Describe what an electromagnet is and list the 2 ways to increase it’s strength.

Answer 4

electromagnet- temporary magnet made by placing a piece of iron inside a current carrying coil of wire
- increase the strength of its current
- more loops/coils
U8 C4 pg 26

Question 5

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

Answer 5

when non magnetic objects are placed in a strong enough magnetic field & become magnetized due to poles within their atoms aligning (all e- orient in same direction)
U8 C4 pg 25

Question 6

Electric charges always flow from ______ areas to _____ areas.

Answer 6

negative, positive

U8 C2 pg 7

Question 7

The function of a generator is to change _______.

Answer 7

mechanical energy to electrical energy

Jeopardy

Question 8

Circuit _____ represents the way homes are usually wired.

Answer 8

B.
Circuit A= Series Circuit
Circuit B= Parallel Circuit
U8 C3 pg 12

Question 9

Laser printers work with the use of heat and positive and negative charges. The laser etches a negative charge on spots of the printer drum in the form of text or images. The plastic ink dust is attracted to the places on the drum with this negative charge. What is the charge of the plastic ink dots themselves?

Answer 9

positive

U8 C1 pg 3

Question 10

Which of the following statements about electric charge is true?

Answer 10

Electrical forces act at a distance.

U8 C1 pg 3

Question 11

What process is the method by which a neutral object obtains an electrical charge from a distance?

Answer 11

induction

U8 C1 pg 4

Question 12

The Law of Conservation of Charge states that______.

Answer 12

charge cannot be created and destroyed but it can be transferred.
U8 C1 pg 3