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Flashcards in Cells And Batteries Deck (23)
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1

Two basic types of cells

Primary and secondary

2

A rechargeable battery is classified as a.....

Secondary cell

3

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

A volt drop due to the internal resistance in the cell

4

What is a battery ?

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

5

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

Materials used for the electrodes and electrolyte

6

What two basic factors affect the capacity of a cell?

Plate mass and plate area

7

What are the three main types of lead acid batteries?

Flooded cell
Gelled electrolyte
Absorptive glass mat ( AGM )

8

What is the positive electrode in a lead acid cell?

Lead dioxide or lead peroxide

9

What is the negative electrode in a lead acid cell?

Spongy metallic lead.

10

What is the electrolyte on a lead acid cell?

Sulphuric acid and water

11

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

Lead dioxide or lead peroxide
Spongy lead

12

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

1.25 and 1.28

13

The electrolyte used in a lead acid cell is?

Sulphuric acid and water

14

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

Decreases

15

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

2.1 V

16

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

1.75V

17

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

It decreases

18

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

Lower maintenance
Operational in any position
Corrosion resistant

19

What are two types of vrla batteries

Gelled electrolyte and AGM

20

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

10 cells

21

The electrolyte in a ni-cad cell is?

Potassium hydroxide

22

State four advantages of using a ni-cad battery ?

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

23

The electrodes in a ni-cad are made of?

Nickel hydroxide and cadmium hydroxide