Magnetism And Its Uses

Front 1

Magnetism

Back 1

Properties & intereactions of magnets

Front 2

Magnetic Force

Back 2

Interaction between 2 magnets

Front 3

Magnetic Field

Back 3

Created by each atom, exerts the magnetic force, surrounds the magnet, & is strongest closest to the magnet

Front 4

Magnetic Poles

Back 4

Regions of a magnet where the magnetic force exerted by the magnet is strongest

Front 5

Magnetic Materials

Back 5

Iron, cobalt, nickel

Front 6

Magnetic Domains

Back 6

Groups of atoms with aligned magnetic poles, like poles point in same direction

Front 7

Moving Charges Produce:

Back 7

Magnetic fields

Front 8

Direction of Field Depends on:

Back 8

Direction of the current

Front 9

Strength of Magnetic Fields Depends on:

Back 9

Amount of current flowing in the wire

Front 10

Electromagnet

Back 10

Temporary magnet made by placing a piece of iron inside a currnet-carrying coil of wire, Converts electrical energy into mechanical energy to do work

Front 11

Increase Strength of Magnetic Fields by:

Back 11

Adding turns to wire coil or increasing current

Front 12

Galvanometer

Back 12

Device that uses an electromagnet to measure current

Front 13

Electric Motor

Back 13

Device that changes electrical energy into mechanical energy, Connected to voltage source

Front 14

How Electric Motor Works

Back 14

Electromagnet is free to rotate between poles of permanent, fixed magnet. Magnetic field produced in coil from current. Direction changes of current cause coil to rotate.

Front 15

How Rotation Speed of Electric Motors Controlled

Back 15

Vary amount of current flowing through coil, More current = stronger magnetic field & coil turns faster

Front 16

Electromagnetic Induction

Back 16

Production of electric current by moving a loop of wire through a magnetic field/moving a magnet through a wire loop

Front 17

Generator

Back 17

Device that produces electric current by rotating a wire coil in magnetic field

Front 18

How Generator Works

Back 18

Wire coil wrapped around iron core is placed between poles of a permanent magnet. Coil is rotated by mechanical energy and electric current flows through coil. Direction of current in coil changes twice w/ each revolution.

Front 19

Direct Current (DC)

Back 19

Current that flows in 1 direction through wire

Front 20

Alternating Current (AC)

Back 20

Reverses direction of the current flow in regular way (In USA, generators produce a frequency 60 cycles per second/60Hz)

Front 21

Transformer

Back 21

Device that increases or decreases the voltage of alternating current, Made of 2 coils (primary & secondary) wrapped around same iron core

Front 22

Step-up Transformer

Back 22

Increases voltage, Secondary coil has more turns of wire than primary coil does

Front 23

Step-down Transformer

Back 23

Reduced voltage, Secondary coil has fewer turns of wire than primary

Front 24

Commutator

Back 24

Reversing switch in a motor that rotates w/ an electromagnet

Front 25

Ammeters

Back 25

Measure the electrical current passing through a circuit

Front 26

Brushes

Back 26

Electrical outlets in a motor that transferss energy from the motor to the commutator