[FEE] Lecture 4

Question 1

What happens to the resistance as the number of collisions increase?

Answer 1

Resistance will have a relatively linear increase

Question 2

rate at which the resistance changes with the variation of temperature

Answer 2

Temperature coefficient (α)

Question 3

What happens to the number of collisions as temperature increases

Answer 3

the number of collision increases

Question 4

Any material for which resistance increases as temperature increases is to have a __

Answer 4

positive temperature coefficient (+α)

Question 5

In semi-conductors, what is the relationship between temperature and resistance?

Answer 5

inversely proportional

Question 6

Temperature and resistance equation

Answer 6

R2 / T + t2 = R1/ T + t1

Question 7

Temperature coefficient formula (given T and t)

Answer 7

α1 = 1/ T + t1

Question 8

Resistance2 formula (temp-coefficient formula)

Answer 8

R2 = R1 [1+α1 (t2 - t1)]

Question 9

Temperature coefficient of copper

Answer 9

0.00393

Question 10

Temperature coefficient of Silver

Answer 10

0.0038

Question 11

Temperature coefficient of Aluminum

Answer 11

0.00391

Question 12

Temperature coefficient of tungsten

Answer 12

0.0045

Question 13

Temperature intercept of copper

Answer 13

234.5

Question 14

Temperature intercept of silver

Answer 14

243

Question 15

Temperature intercept of aluminum

Answer 15

236

Question 16

A measure of the material’s ability to conduct electric current.

Answer 16

Conductance

Question 17

Reciprocal of resistance

Answer 17

Conductance

Question 18

unit of conductance

Answer 18

Siemens

Question 19

Siemens unit came from who?

Answer 19

Ernst Werner von Siemens