Deck 9: Cells and Batteries

Question 1

An electrochemical cell

A) stores charge
B) produces the electrical charges which then pass through a circuit
C) uses a chemical reaction to separate charges

Answer 1

uses a chemical reaction to separate charges

Question 2

A disposable cell is classified as

A) a battery
B) a primary cell
C) a secondary cell
D) an electrolytic cell

Answer 2

a primary cell

Question 3

A rechargeable cell is classified as

A) a battery
B) a primary cell
C) a secondary cell
D) an electrolytic cell

Answer 3

a secondary cell

Question 4

The capacity of a cell is generally expressed in

A) amperes
B) volts
C) ampere hours
D) watts

Question 5

The capacity of cells may also be expressed in

A) watt hours
B) hours
C) newton metres
D) kilograms per cubic metre

Question 6

A cell's __________ determines the maximum value of continuous current a cell can supply without overheating

A) capacity
B) discharge rate
C) state of charge
D) relative density

Question 7

A 'Simple' or 'Voltaic' cell, comprises electrodes of __________ and __________ , with an electrolyte of __________

A) carbon, zinc, dilute sulfuric acid
B) lead sulfate, lead peroxide, dilute sulfuric acid
C) zinc, copper, dilute sulfuric acid
D) zinc, copper, potassium hydroxide

Question 8

The electromotive force developed by any chemical cell depends on how far apart the electrodes are

A) in terms of their distance
B) in terms of their resistivities
C) on the electrochemical series

Question 9

In a cell having electrodes of zinc and copper, the negative electrode is always the

A) zinc electrode
B) copper electrode

Question 10

The term 'polarisation' describes

A) the polarity of a cell's electrodes
B) the reverseal of a cell's polarity
C) the formation of hydrogen gas bubbles on the positive electrode

Question 11

The effect of 'polarisation' is to

A) determine the direction of current supplied by the cell
B) reverse the direction of current supplied by the cell
C) significantly reduce the electromotive force produced by the cell

Question 12

The electrolyte used in a 'dry Leclanche' cell is a

A) dilute sulfuric acid
B) manganese dioxide gel
C) manganese dioxide and powdered carbon
D) ammonium chloride gel

Question 13

The purpose of manganese dioxide and powdered carbon mixture in a 'dry Leclanche' cell is to

A) act as an electrolyte
B) reduce the cell's internal resistance
C) act as a depolarising agent
D) turn the electrolyte into a paste

Question 14

Silver-oxide cells and mercury cells offer the following advantage/advantages:

A) high capacity in comparison with their size
B) long shelf life
C) are small enough to be used in watches, hearing aids, etc.
D) each of the above

Question 15

A fully-charged lead-acid cell comprises electrodes of __________ and __________, and an electrolyte of __________.

A) lead dioxide, metallic lead, dilute sulfuric acid
B) lead sulfate, lead peroxide, dilute sulfuric acid
C) lead sulfate, metallic lead, dilute sulfuric acid
D) lead dioxide, metallic lead , concentrated sulfuric acid

Question 16

The state of charge of a lead-acid cell may be determined by measuring its

A) voltage
B) current
C) relative density
D) temperature

Question 17

When a lead-acid cell de-energizes, both electrodes undergo a chemical reaction, with each changing to

A) metallic lead
B) lead dioxide
C) lead peroxide
D) lead sulfate

Question 18

As a lead-acid cell de-energizes, its relative density

A) remains approximately constant
B) increases towards 1.27
C) falls towards 1.17
D) increases towards 1.84.

Question 19

The device used to measure a lead-acid cell's relative density is called a

A) hydrometer
B) hygrometer
C) densiometer
D) calorimeter

Question 20

Memory effect' and 'voltage depression' are two drawbacks associated with

A) lead-acid cells
B) nickel-cadmium cells
C) lithium-ion cells
D) alkaline cells

Question 21

The major advantages associated with lithium-ion cells are

A) high capacity/weight ratio
B) no 'memory effect' or 'voltage depression' problems
C) capable of large number of energizing/de-energizing cycles
D) all of the above

Question 22

The legislation which deals with the responsible disposal of used cells and batteries is the

A) Electricity Supply Regulations
B) Health and Safety at Work Regulations
C) Waste Electronic and Electrical Equipment Directive
D) Electricity at Work Act

Question 23

When three identical cells are connected in series, the resulting e.m.f. is __________ that of one cell

A) one-third
B) the same as
C) three times

Question 24

When three identical cells are connected in series, the resulting current capacity is __________ that of one cell

A) one-third
B) the same as
C) three times

Question 25

When three identical cells are connected in parallel, the resulting e.m.f. is __________ times that of one cell

A) one-third
B) the same as
C) three times

Question 26

When three identical cells are connected in parallel, the resulting current capacity is __________ times that of one cell

A) one-third
B) the same as
C) three times

Question 27

When connecting cells in series or parallel to create a battery,

A) they should all be of the same type
B) they should all be of the same brand
C) their capacities may vary
D) they must all be disposable types