Review Guide- Chapter 21

Front 1

Poles

Back 1

Like poles repel each other unlike poles attract each other

Front 2

Magnetic field

Back 2

A magnetic field is the magnetic effect of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field.

Front 3

Magnetic Domain

Back 3

A magnetic domain is region in which themagnetic fields of atoms are grouped together and aligned. In the experiment below, themagnetic domains are indicated by the arrows in the metal material. You can think of magnetic domains as miniature magnets within a material.

Front 4

demagnetize breaking

Back 4

magnets can be demagnetized by heating or by striking with heavy blows if broken in half and 2 new ones form.

Front 5

magnetism

Back 5

Magnetism is the force where objects are attracted or repelled to one another. Usually these objects are metals such as iron. Magnetic Poles, Forces, and Fields. Every magnet has two poles.

Front 6

electromagnetism

Back 6

Electromagnetism is a branch of physics which involves the study of the electromagneticforce, a type of physical interaction that occurs between electrically charged particles. Theelectromagnetic force usually showselectromagnetic fields, such as electric fields, magnetic fields, and light.

Front 7

electromagnet

Back 7

An electromagnet is simply a coil of wire. It is usually wound around an iron core. However, it could be wound around an air core, in which case it is called a solenoid. When connected to a DC voltage or current source, theelectromagnet becomes energized, creating a magnetic field just like a permanent magnet.

Front 8

ferromagnetic

Back 8

(of a body or substance) having a high susceptibility to magnetization, the strength of which depends on that of the applied magnetizing field, and that may persist after removal of the applied field. This is the kind of magnetism displayed by iron and is associated with parallel magnetic alignment of neighboring atoms.

Front 9

Ferromagnetic core

Back 9

It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in thecore material. The magnetic field is often created by a coil of wire around the core that carries a current.

Front 10

magnetosphere

Back 10

the region surrounding the earth or another astronomical body in which its magnetic field is the predominant effective magnetic field.

Front 11

declination

Back 11

the angular distance of a point north or south of the celestial equator.

Front 12

magnetic fields

Back 12

a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

Front 13

magnetic field lines

Back 13

A pictorial representation of magnetic field lines is very useful in visualizing the strength and direction of the magnetic field . The direction of magnetic field lines is defined to be the direction in which the north end of a compass needle points.

Front 14

genorater

Back 14

an apparatus for producing gas, steam, or another product.

Front 15

transformor

Back 15

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

Front 16

turbine

Back 16

a machine for producing continuous power in which a wheel or rotor, typically fitted with vanes, is made to revolve by a fast-moving flow of water, steam, gas, air, or other fluid.

Front 17

solenoid

Back 17

A solenoid is a type of electromagnet when the purpose is to generate a controlled magnetic field. If the purpose of the solenoid is instead to impede changes in the electric current, asolenoid can be more specifically classified as an inductor rather than an electromagnet.

Front 18

electric motor

Back 18

An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.

Front 19

electromagnet

Back 19

a soft metal core made into a magnet by the passage of electric current through a coil surrounding it.

Front 20

galvanometer

Back 20

n instrument used to detect, measure, and determine the direction of small electric currents by means of mechanicaleffects produced by a current-carrying coil in a magnetic field

Front 21

Atoms

Back 21

atoms as a source of nuclear energy.

Front 22

electrons

Back 22

a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Front 23

direct current

Back 23

an electric current flowing in one direction only.

Front 24

alternating current

Back 24

an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.

Front 25

electrical energy

Back 25

Electrical energy is defined as an electric charge that lets work be accomplished. An example of electrical energy is power from a plug outlet. YourDictionary definition and usage example.