Chapter 23

Question 1

magnetosphere

Answer 1

region of space affected by earth’s magnetic field

Question 2

magnetic domain

Answer 2

group of atoms whose fields point in the same direction

Question 3

magnetic field

Answer 3

surrounds a magnet and exerts a magnetic force on other magnets

Question 4

electromagnet

Answer 4

magnet created by wrapping a current-carrying wire around an iron core

Question 5

motor

Answer 5

device that transforms electrical energy into kinetic energy

Question 6

aurora

Answer 6

light display that occurs when charged particles trapped in the magnetosphere collide with earth’s atmosphere above the poles

Question 7

generator

Answer 7

device that uses a magnetic field to turn kinetic energy into electrical energy

Question 8

alternating current

Answer 8

electric current that changes its direction repeatdly

Question 9

direct current

Answer 9

electric current that flows only in one direction

Question 10

transformer

Answer 10

device used to increase of decrease the voltage of an alternating current