Electricty

Question 1

The electric current is

Answer 1

The rate of flow of charge in the wire or component

Question 2

The charge is due to

Answer 2

The passage of charged particles–

Referred to as charge carriers

Question 3

In metals the charge carriers are conduction electrons

Answer 3

The move about inside the metal repeatedly colliding with each other and fixed positive iOns in the metal

Question 4

When an elector. Current is passed through a salt solution the charge is carried by

Answer 4

Ions

Which are

Charged atoms or molecules

Question 5

IOns

Answer 5

Charged atoms or molecule

Question 6

Electrons enter the battery at the

Answer 6

Positive terminal, peace through negative terminal

Question 7

Ampere Is unit for current

Symbol I

Answer 7

Charge unit is coulomb

Question 8

Coulomb unit of charge (Q) is equal to

Answer 8

Charge flow in one second when the current is one ampere

Question 9

For current I, the charge flow /\Q in time /\t is given by

Answer 9

/\ Q= I /\t

Question 10

Magnitude of charge of one electron is

Answer 10

1.6 x10^ -19

Question 11

Electrical terms

Conductors
Insulators
Semiconductors

Answer 11

R.E.M.

Question 12

Insulator- each electron is attached to an

Answer 12

Atom and cannot move away

When a voltage is applied, no current passes through because electrons cannot move through insulator

Question 13

Metallic conductor- most electrons are attached to atoms but some are d-

Answer 13

Delocalised.

The d- electrons are the charge carriers in the metal

When a voltage is applied these conduction electrons are attached to positive terminal of the metal

Question 14

Semiconductor- the no. Of charge carriers increases with bigger temp.

And resistance decreases as temp is raised

Answer 14

A pure semi conductor material - intrinsic semiconductor

Conduction is due to electrons that break free from the atoms o the semiconductor