8 Charge And Current

Question 1

Electric current definition

Answer 1

The rate of flow of charge

Question 2

I = delta Q / delta t

Answer 2

Current = change in charge / change in time

Question 3

Coulombs definition

Answer 3

The electric charge flowing past a point in one second where there is an electric current of one ampere

Question 4

Coulombs SI base unit

Answer 4

As

Question 5

Electric current SI base unit

Answer 5

A

Question 6

Charge of an electron

Answer 6

1.6 x 10 ^ -19

Question 7

Quantised definition

Answer 7

Can only have certain values

Question 8

Milligan’s experiment

Answer 8

Oil drop experiment to find the charge of an electron

Question 9

What causes a larger current

Answer 9

A greater number of electrons
Faster moving electrons

Question 10

What states are electrolytes in

Answer 10

Molten ionic compounds or ionic solutions

Question 11

Positive electrode

Answer 11

Anode attracts anions negative ions

Question 12

Negative electrode

Answer 12

Cathode attracts positive ions cations

Question 13

Ammeter

Answer 13

Measures in series aims to have 0 resisitance

Question 14

Conservation of charge

Answer 14

Electric charge can neither be created nor destroyed

Question 15

Kirchhoff’s first law

Answer 15

The sum of currents into a point is equal to the sum of current out of that point

Question 16

Number density

Answer 16

The number of free charge carriers per unit volume

Question 17

What determines conductivity

Answer 17

A higher number density means an object is more conductive

Question 18

I = Anev

Answer 18

Current = cross sectional area x number density x charge of an electron x mean drift velocity