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Op's 1st > Electricity 6 Of 7 > Flashcards

Electricity 6 Of 7 Flashcards

1
Q

The battery is the most important power source in use because?

A

It’s energy is self-contained

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2
Q

The battery is used mostly wherever a ___________ Power source is required.

A

Portable

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3
Q

The battery is also used as a _________ source of voltage in a voltage standard.

A

Calibrated

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4
Q

What are the two classes of battery’s?

A

Primary and secondary.

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5
Q

The __________ battery converts chemical energy into electrical energy directly, using the chemical materials within the cell to start the action.

A

Primary

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6
Q

The _________ battery must first be charged before it can convert chemical energy into electrical energy.

A

Secondary

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7
Q

The secondary battery is frequently called?

A

A storage battery.

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8
Q

The ______ is the basic unit of the battery.

A

Cell

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9
Q

The ______ battery is used when limited current is required and the _________ battery is used when a heavy current is required.

A

Primary,

Secondary

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10
Q

The metals in a cell are called?

A

Electrodes

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11
Q

The amount of chemical activity that the electrolyte causes and the type of metal used for the electrodes will help determine the__________ and __________ output of the cell

A

Voltage and current

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12
Q

What is a disadvantage of the primary wet cell?

A

As the battery is used, the negative electrode disintegrates.

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13
Q

The basic primary wet cell is usually called the __________.

A

Voltaic cell

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14
Q

3, 1.5 volt batteries connected in series produces how much voltage?

A

4.5v

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15
Q

How many voltage ratings do batteries have?

A

Two.
A no-load rating, and
A normal load rating

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16
Q

What determines the useful life of a cell?

A

The amount of current flowing through a cell.

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17
Q

A cell’s ratings and life depend on its _____________.

A

Internal resistance.

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18
Q

Lead-acid batteries should never be overcharged because?

A

Overcharging causes explosive hydrogen and oxygen gases.

19
Q

When an electric charging current is applied to a lead-acid battery, one electrode turns into _____ and the other turns into ___________.

A

Spongy lead

Lead peroxide

20
Q

To reduce Sulfation, the lead-acid cell must be kept _________, and the electorate level must be kept at least 3/8 inch above the plates.

A

Charged.

21
Q

The state of charge can be determined by measuring the specific gravity of the electrolyte with a __________.

A

Hydrometer.

22
Q

The photoconductive cell is basically a variable resistive device that permits more current to flow in a circuit when it is struck by____________.

A

Light

23
Q

A photovoltaic cell uses dissimilar __________ materials and a thermoelectric cell used dissimilar metals.

A

Semiconductors

24
Q

A ________ generator uses heat and chemical activity to generate a charge.

A

Thermionic

25
Q

A generator produces electricity by the ____________ of a group of conductors in a magnetic field.

A

Rotation

26
Q

What are the two types of generators?

A

Ac, and

Dc generators

27
Q

When excitation current is produced from the generators own output, the generator is a _____________ generator.

A

Self-excited.

28
Q

Batteries are rated according to the amount of ________ they can supply in a given amount of time.

A

Current

29
Q

A simple dc generator consist of 4 basic parts. What are they?

A

1) a magnetic field
2) a conductor, in the form of a loop
3) a commutator
4) and brushes

30
Q

The magnetic field of a generator can be produced by what two things?

A

A magnet or electromagnet

31
Q

Armature reaction and self-induction of the armature coils tend to shift the position of the _________.

A

Neutral plane

32
Q

Interpoles are connected in ___________ with the armature winding to oppose the magnetic field of the armature winding.

A

Series

33
Q

In many generators, the brushes are electrically connected to the brush holders by braided copper wires called ___________.

A

Pigtails

34
Q

The simplest ac generator consists of?

A

A magnetic field and a single rotating loop.

35
Q

In an ac generator, the ends of the loop are some way connected directly to__________ instead of a commutator like the dc generator.

A

The brushes

36
Q

How many degrees apart are the voltages of a three phase generator?

A

120 degrees

37
Q

The wye connection gives an increase in ____________ but not __________

A

Voltage

Current

38
Q

The delta connection increases ________ but not _________.

A

Current

Voltage

39
Q 
Control bus batteries are used to supply electrical power to:
A) operate oil circuit breakers
B) emergency pumps
C) emergency lighting systems
D) all of the above
A

D

40
Q

The dry cell battery is a?

A

Primary cell

41
Q

What is the main difference between a primary and secondary battery?

A

A primary battery cannot be charged while a secondary battery can.

42
Q

Polarization is due to the neutral gas bubbles that collect around the?

A

positive electrode

43
Q

A battery being charged begins to gas freely. The current should be?

A

Decreased

44
Q

The number of negative plates in a lead-acid cell is?

A

Always 1 more than the number of positive plates.

Op's 1st (13 decks)

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