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Flashcards in Electricity 6 Of 7 Deck (44)
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1

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

It’s energy is self-contained

2

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

Portable

3

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

Calibrated

4

What are the two classes of battery’s?

Primary and secondary.

5

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

Primary

6

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

Secondary

7

The secondary battery is frequently called?

A storage battery.

8

The ______ is the basic unit of the battery.

Cell

9

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

Primary,
Secondary

10

The metals in a cell are called?

Electrodes

11

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

Voltage and current

12

What is a disadvantage of the primary wet cell?

As the battery is used, the negative electrode disintegrates.

13

The basic primary wet cell is usually called the __________.

Voltaic cell

14

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

4.5v

15

How many voltage ratings do batteries have?

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

16

What determines the useful life of a cell?

The amount of current flowing through a cell.

17

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

Internal resistance.

18

Lead-acid batteries should never be overcharged because?

Overcharging causes explosive hydrogen and oxygen gases.

19

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

Spongy lead
Lead peroxide

20

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.

Charged.

21

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

Hydrometer.

22

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

Light

23

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

Semiconductors

24

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

Thermionic

25

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

Rotation

26

What are the two types of generators?

Ac, and
Dc generators

27

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

Self-excited.

28

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

Current

29

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

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

30

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

A magnet or electromagnet