Question 1

In increase in resistance as a result of an increase in temperature is typical for most&#10;A) pure-metal conductors&#10;B) insulators&#10;C) semiconductors

Accepted Answer

The increase in resistance as a result of an increase in temperature is typical for most pure-metal conductors. This is due to the fact that increasing temperature increases the vibrations of atoms within the conductor, leading to more collisions and hindering the flow of electrons. As a result, the resistance increases. Insulators and semiconductors may also see an increase in resistance with temperature, but it is not as pronounced as in pure-metal conductors.

Question 2

The resistance of carbon __________ when its temperature increases&#10;A) remains constant&#10;B) increases&#10;C) falls

Accepted Answer

The resistance of carbon decreases as its temperature increases due to its negative temperature coefficient of resistance.

Question 3

Metal alloys, such as constantan, are designed so that their resistance __________ for variations in temperature&#10;A) remains approximately constant&#10;B) increases significantly&#10;C) falls significantly

Accepted Answer

Metal alloys like constantan are known as "thermally compensated alloys," meaning they are formulated to have a near-zero temperature coefficient of resistance, which allows them to maintain a relatively constant resistance even as the temperature changes. Therefore, their resistance remains approximately constant.

Question 4

The property of a material which affects its change of resistance for variations in temperature is called its&#10;A) resistivity&#10;B) temperature coefficient of resistivity&#10;C) temperature coefficient of resistance

Accepted Answer

The temperature coefficient of resistance is a property that quantifies how the resistance of a material changes with temperature.

Question 5

A material whose resistance falls as its temperature increases is said to have a&#10;A) positive temperature coefficient of resistance&#10;B) positive temperature coefficient of resistivity&#10;C) negative temperature coefficient of resistance&#10;D) negative temperature coefficient of resistivity

Accepted Answer

A material whose resistance falls as its temperature increases is said to have a negative temperature coefficient of resistance. The word "resistivity" refers to the inherent property of a material to resist the flow of electric current. The word "resistance" specifically refers to the opposition that a material offers to the flow of current.

Question 6

The relationship between temperature and resistance, for metal conductors, is linear down to absolute zero

Accepted Answer

For metal conductors, the relationship between temperature and resistance is not linear as it approaches absolute zero. Resistance decreases as temperature decreases, but the rate of decrease changes, and it does not follow a straight line down to absolute zero.

Deck 6: Effect of Temperature Change Upon Resistance