Ch. 11 Flashcards

0
Q

What are the ring of coils surrounding the rotor called?

A

Stator

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1
Q

What are machines that convert electrical energy into rotary mechanical motion?

A

Motors

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2
Q

What are connected to the circuit slip across the face of the commutator as it rotates under earth them?

A

Electrical brushes

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3
Q

What is modeled using magnetic lines of force?

A

Magnetic field

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4
Q

What is a transformer that increases output voltage?

A

Step-up conductors

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5
Q

The removing of these causes the formation of a permanent magnet

A

External magnetic field

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6
Q

What is a machine that converts the energy of a moving fluid into rotational motion?

A

Turbine

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7
Q

What are the most common prime mover for commercial electrical generators?

A

Steam turbines

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8
Q

The location of the earths concentrated magnetic field lines are vertical at the earths surface

A

Magnetic North Pole

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9
Q

What are certain materials that lose all electrical resistance at extremely low temperatures?

A

Superconductors

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10
Q

Who were the first people to use magnetic compasses?

A

Chinese

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11
Q

Who changes magnetism from superstition to science?

A

William Gilbert

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12
Q

Magnetic lines of force point

A

Toward the source magnetic pole

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13
Q

Which of the following will not attract or repel each other?

A

A magnet and a stationary charge

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14
Q

Which of the following will induce a current in a nearby circuit?

A

A moving electromagnet

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15
Q

Most of the electricity we use in our homes is supplied by a

A

AC generator

16
Q

Geothermal energy generation uses what kind of turbine?

17
Q

Which of the following is a step-up transformer?

A

Fir coil– 7 wraps; second coil– 8 wraps

18
Q

The first practical use of natural magnets was navigations.

19
Q

William Gilbert was the first person to experiment with magnets.

20
Q

Magnetic fields interact with each other just like electric fields.

21
Q

It is possible for a magnet to have only one pole.

22
Q

The strongest magnets are made out of pure substances.

23
Q

Liquid oxygen and gaseous oxygen display different magnetic properties.

24
Magnets strongly attract all metals.
False
25
Natural magnets, such as lodestones, display ferrimagnetism.
True
26
Diamagnetic materials do not contain dipoles.
False
27
Temperature does not have strong affect on a ferromagnetic object.
False
28
At the geographic North Pole, a compass will point south.
True
29
A ferromagnetic material above its Curie temperature will behave like a paramagnetic material when it is place Ina magnetic field.
True
30
A magnet moving back and forth in the center of a coil of wire produces direct current in the wire.
False
31
A stator is a pair of solenoids.
True
32
Generators can produce only alternating current.
False