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Chapter 2-Magnetism
What is magnetism; Electricity & Magnetism
13
Science
7th Grade
01/04/2012

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Term
magnetic field
Definition
field that surrounds a magnet and exerts a magnetic force on other magnets
Term
magnetic domain
Definition
group of atoms whose fields point in the same direction
Term
magnetosphere
Definition
region of space affected by Earth's magnetic field
Term
electromagnet
Definition
magnet created by wrapping a current-carrying wire around an iron core
Term
alternating current
Definition
electric current that changes its direction repeatedly
Term
direct current
Definition
electric current that only flows in one direction
Term
aurora
Definition
light display that occurs when charged particles trapped in the magnetosphere collide with Earth's atmosphere above the poles
Term
generator
Definition
device that uses a magnetic field to turn kinetic energy into electrical energy
Term
transformer
Definition
device used to increase or decrease the voltage of an alternating current
Term
voltage
Definition
a measure of the amount of electrical potential energy an electron flowing in a circuit can gain; measured in volts (V)
Term
voltage
Definition
a measure of the amount of electrical potential energy an electron flowing in a circuit can gain; measured in volts (V)
Term
superconductor
Definition
a conductor that has no resistance to the flow of electrons
Term
MRI
Definition
a machine that uses a magnetic field to create pictures of the inside human body
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