science chapter 20 Flashcards

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1
Q

any object that attracts the metal iron

A

magnet

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2
Q

a place on a magnet where the force it applies is the strongest

A

magnetic pole

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3
Q

The names of the two magnetic poles on all magnets

A

north pole and south pole

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4
Q

A force of attraction of repulsion between the poles of two magnets

A

magnetic force

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5
Q

An invisible magnetic field surrounds

A

all magnets, applying force on other magnets

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6
Q

magnetic fields represented by

A

magnetic field lines

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7
Q

what does assertion mean

A

forceful statement of fact or belief: to defend

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8
Q

Any material that is strongly attracted to a magnet

A

magnetic material

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9
Q

elements including iron, nickel, and cobalt, that have an especially strong attraction to magnets

A

Ferromagnetic elements

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10
Q

not all materials are magnetic, but

A

a magnetic field surrounds all materials

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11
Q

a region in a magnetic material in which the magnetic fields of the atoms all point in the same direction

A

magnetic domain

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12
Q

A magnet that quickly loses its magnetic field after being removed from a magnetic field

A

temporary magnet

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13
Q

A magnet that remains a magnet after being removed from another magnetic field

A

permanent magnet

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14
Q

a magnet created by wrapping a current-carrying wire around a ferromagnetic core

A

electromagnet

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15
Q

a special type of temporary magnet

A

electromagnet

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16
Q

a device that uses an electric current to produce motion

A

electric motor

17
Q

a device that uses a magnetic field to transform mechanical energy to electric energy

A

electric generator

18
Q

electric current that flows in one direction

A

direct current

19
Q

electric current that changes direction in a regular pattern

A

alternating current

20
Q

a switch that rotates with the wire coil and prevents the current from changing directions

A

a commutator

21
Q

a shaft with a set of blades that spins when a stream of pressurized fluid strikes the blades

A

turbine

22
Q

a device that changes the voltage of an alternating current

A

transformer

23
Q

marconi

A

stole credit for radio

24
Q

niagara falls

A

tesla was interested in before america

25
Q

Eddison =

A

DC

26
Q

Tesla =

A

AC

27
Q

Westinghouse

A

allie of Tesla when he quit Edison business