8.1+ 8.2 Charge

Question 1

what is electrical current?

Answer 1

the rate of flow of charge

Question 2

what is the coulumb?

Answer 2

• the unit for charge
• the flow of charge in a times of 1 second where the current is 1Ampere

Question 3

what is the elementary charge (e)?

Answer 3

• 1.6x10^-19 C

Question 4

how is the net charge of an object determined?

Answer 4

• quantised by the number of electrons (elementary charge)

Question 5

what is the direction of conventional current

Answer 5

positive to negative

used in questions

Question 6

what is the direction of electron flow?

Answer 6

negative to positive

not used explicitly

Question 7

how is current measured?

Answer 7

ammeter in series,
lowest resistance as possible to not affect readings

Question 8

what is a charge carrier?

Answer 8

any partcle with an electrical charge
* electrons
* ions

Question 9

what is current in
* metals
* electrolytes?

Answer 9

• electrolytes: movement of ions
• metals - movement of delocalised electrons