Electrical Properties of Matter

Question 1

Semiconductor

Answer 1

is a material which ,on application of an emf, facilitates a ‘moderate’ current flow.(Silicone , Germanium). 1 electron in every 10^8 atoms available for conduction.

Question 2

Emf

Answer 2

Electromotive force is defined as the electric potential produced by either an electrochemical cell or by changing the magnetic field.

Question 3

Insulators (Dielectric)

Answer 3

a material which , on application of an emf, facilitates electric current poorly. (electrons tightly bound)

Question 4

Conductor

Answer 4

a material which, on application of an emf, facilitates current (charge transfer) well. electrons loosely bound. 1 electron per atom is available for conduction.

Question 5

Anode

Answer 5

positive charge

Question 6

Cathode

Answer 6

negative charge

Question 7

Proton

Answer 7

positive charge

Question 8

Electron

Answer 8

negative charge

Question 9

Neutron

Answer 9

neutral , no charge

Question 10

How many p+ and e- are in an uncharged atom?

Answer 10

there are equal numbers of protons an electrons in an uncharged atom.

Question 11

Atomic number

Answer 11

number of protons