Chapter 8.2 - Moving Charges

Question 1

What are the charger carriers in metals + liquids

Answer 1

• Electrons (metals)

* Ions (liquids)

Question 2

Describe the structure of metal + electrons

Answer 2

• Regular crystal structure / lattice
• Positive ions
• vibrate in fixed position
• causes temperature increase

• Surrounded by delocalised electrons

Question 3

Reasons for current in a wire to be increased

Answer 3

• More electrons per given point per second (greater cross-sectional area)
• Same number of electrons but moves faster

Question 4

Which way is conventional current + electron flow

Answer 4

• Conventional current [positive to negative]

* Electron flow [negative to positive]

Question 5

Electrolyte definition

Answer 5

• Liquid that can have free to move charge carriers, therefore can conduct electricity
-ions are charge carriers not electrons

• Electrolytes are either molten ionic compounds or mostly ionic solutions

Question 6

How does an electrolyte work

Answer 6

• Positive ions go to cathode
• Negative ions go to anode
• Movement of ions causes flow of charge. (Current)
• Electrons flow through metal part of circuit
• positive ion accepts electron at cathode
• negative ion donates electron at anode

Question 7

How to measure current

Answer 7

• Ammeter
• Placed in series
• lowest possible resistance
• doesn’t effect current