Conduction in materials

Question 1

Conduction in a metallic conductor (wire)

Answer 1

If temperature remains constant resistance doesn’t change

Question 2

Conduction in a filament bulb

Answer 2

As voltage in filament increases current increases
As current increases the filament temperature increases
Causing fixed positive ions to vibrate making it harder for electrons to pass there core resistance increases

Question 3

Positive electrode

Answer 3

Anode

Question 4

Negative anode

Answer 4

Cathode

Question 5

What is the conducting liquid in ionic solutions

Answer 5

Electrolyte

Question 6

Copper electrolysis in active electrodes

Answer 6

When copper sulphate is dissolved into the water it breaks up into its ions
Positive copper ions attract to the negative cathode ,they become deposited on it
Negative sulphate ions are attracted to the positive anode they eat into the anode which forms copper sulphate that re enters the water

Question 7

Inactive electrodes (platinum)

Answer 7

Platinum doesn’t react with copper sulphate solution
Does not obeys ohms law
Charge carriers are positive and negative ions
Graph straight line not through origin

Question 8

Concentrated or diluted solution

Answer 8

Increasing concentration of solution will increase the slope of the line there fore charge carriers increase
Diluting will have the opposite effect
Resulting in resistance decreasing

Question 9

Conduction in gasses

Answer 9

Sts: neon lamps , street lamps

Question 10

Conduction in a vacuum

Answer 10

Electrons leave vacuum my thermionic emission