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Physical Science > Chapter 7: Magnetism and Its Uses > Flashcards

Chapter 7: Magnetism and Its Uses Flashcards

1
Q

refers to the properties and interactions of magnets

A

magnetism

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2
Q

a region of space that surrounds a magnet and exerts a force on other magnets and objects made of magnetic materials

A

magnetic field

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3
Q

the regions of a magnet that exert the strongest force

A

magnetic poles

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4
Q

groups of atoms with aligned magnetic poles

A

magnetic domains

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5
Q

attractive or repulsive force between electric charges and magnets

A

electromagnetic force

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6
Q

interaction between electric charges and magnets

A

electromagnetism

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7
Q

a single wire wrapped into a cylindrical wire coil

A

solenoid

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8
Q

a temporary magnet created when there is a current in a wire coil

A

electromagnet

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9
Q

a device that uses an electromagnet to measure electric current

A

galvanometer

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10
Q

a device that changes electrical energy into mechanical energy

A

electric motor

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11
Q

the generation of an electric current by a changing magnetic field

A

electromagnetic induction

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12
Q

uses electromagnetic induction to transform mechanical energy into electrical energy

A

generator

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13
Q

a large wheel that rotates when pushed by water, wind, or steam

A

turbine

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14
Q

electric current that is always in one direction through a wire

A

direct current

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15
Q

electric current that reverses the direction in a regular pattern

A

alternating current

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16
Q

a device that increases or decreases the voltage of an alternating current

A

transformer

17
Q

transformer voltage equation

A

output voltage (volts) / input voltage (volts) = turns in secondary coil / turns in primary coil

Vout/Vin = N2/N1

18
Q

magnets are surrounded by a ________ that exerts a ______ on all __________ __________.

A

magnetic field; force; magnetic materials

19
Q

magnet exerts force on…

A

other magnets

20
Q

atoms in magnetic materials behave like…

A

magnets

21
Q

in a permanent magnet, the magnetic domains remain aligned without…

A

an external magnetic field

22
Q

an electric current in a wire is surrounded by…

A

a magnetic field

23
Q

the electromagnet force is one of the…

A

fundamental forces

24
Q

magnetic field strength of an electromagnet can be controlled by:

A

changing the number of wire loops and by changing the current in the wire

25
Q

in a simple electric motor, an electromagnet rotates between the poles of a…

A

permanent magnet

26
Q

a changing magnetic field produces…

A

an electric current in a wire loop

27
Q

a generator transforms mechanical energy into…

A

electrical energy

28
Q

direct current is…

A

current in one direction

29
Q

alternating current changes direction in…

A

a regular pattern

30
Q

a transformer __________ or ___________ the voltage of an alternating current

A

increases; decreases

Physical Science (10 decks)

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