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Theory > Cells And Batteries > Flashcards

Cells And Batteries Flashcards

1
Q

Two basic types of cells

A

Primary and secondary

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2
Q

A rechargeable battery is classified as a…..

A

Secondary cell

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3
Q

What causes the difference between the open circuit terminal voltage of a cell and it’s terminal voltage under load?

A

A volt drop due to the internal resistance in the cell

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4
Q

What is a battery ?

A

A number of cells connected in series which are housed in a single case.

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5
Q

The open circuit voltage or emf of a cell is dependant on what?

A

Materials used for the electrodes and electrolyte

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6
Q

What two basic factors affect the capacity of a cell?

A

Plate mass and plate area

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7
Q

What are the three main types of lead acid batteries?

A

Flooded cell
Gelled electrolyte
Absorptive glass mat ( AGM )

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8
Q

What is the positive electrode in a lead acid cell?

A

Lead dioxide or lead peroxide

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9
Q

What is the negative electrode in a lead acid cell?

A

Spongy metallic lead.

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10
Q

What is the electrolyte on a lead acid cell?

A

Sulphuric acid and water

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11
Q

What two materials are used for the plate electrodes in a lead acid cell?

A

Lead dioxide or lead peroxide

Spongy lead

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12
Q

In a fully charged lead acid cell, the specific gravity of the electrolyte is between….

A

1.25 and 1.28

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13
Q

The electrolyte used in a lead acid cell is?

A

Sulphuric acid and water

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14
Q

As the lead acid cell becomes discharged, the gravity specific gravity of the electrolyte……

A

Decreases

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15
Q

What is the open circuit voltage of a charged lead acid cell?

A

2.1 V

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16
Q

A lead acid cell should be charged before the terminal voltage reaches….?

A

1.75V

17
Q

What happens to the efficiency of a lead acid battery when it is subjected to cold temperatures?

A

It decreases

18
Q

State 3 advantages of using a gelled electrolyte instead of lead acid cell.

A

Lower maintenance
Operational in any position
Corrosion resistant

19
Q

What are two types of vrla batteries

A

Gelled electrolyte and AGM

20
Q

The open circuit voltage of a ni cad cell is 1.2 volts, how many cells would a 12 volt ni-cad battery require?

A

10 cells

21
Q

The electrolyte in a ni-cad cell is?

A

Potassium hydroxide

22
Q

State four advantages of using a ni-cad battery ?

A 
Higher weight to energy ratio
Faster to recharge
Long lifecycle
Low internal resistance
Long shelf life without need for recharge
23
Q

The electrodes in a ni-cad are made of?

A

Nickel hydroxide and cadmium hydroxide

Theory (4 decks)

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