Chapter 19

Question 1

What is a semiconductor?

Answer 1

A semiconductor is a substance whose resistivity is between that of a good conductor and a good insulator

Question 2

What is intrinsic conduction?

Answer 2

Intrinsic conduction is the movement of charge through a pure semiconductor

Question 3

What is extrinsic conduction?

Answer 3

Extrinsic conduction is the movement of charge through a doped semiconductor

Question 4

What is doping?

Answer 4

Doping is the addition of a small amount of another element to a pure semiconductor to increase its conductivity

Question 5

What is an n-type semiconductor?

Answer 5

An n-type semiconductor is one in which the impurity added produces more free electrons available for conduction

Question 6

What is a p-type semiconductor?

Answer 6

A p-type semiconductor is one in which the impurity added produces extra holes which are available for conduction

Question 7

What is a diode?

Answer 7

A diode is a semiconductor device that allows current to flow in one direction only?

Question 8

What is a p-n junction?

Answer 8

A p-n junction is where there is a p-type conductor touching an n-type

Question 9

What is an LDR?

Answer 9

A light dependent resistor is a semiconductor device whose resistance varies from a high value in the dark to a lower value in bright light

Question 10

What is a thermistor?

Answer 10

A thermistor is a semiconductor device whose resistance decreases rapidly with increasing temperature