Question 1 of 10
What is the primary effect of increasing temperature on the resistance of a conductor?
In conductors, increased temperature leads to increased atomic vibrations, hindering electron flow and thus increasing resistance.
Question 2 of 10
What happens to the resistance of a semiconductor when its temperature increases?
In semiconductors, increased temperature provides more energy for electrons to move into the conduction band, allowing for greater current flow and thus reducing resistance.
Question 3 of 10
How does decreasing the temperature affect the resistance of an insulator?
Decreasing the temperature in an insulator reduces the thermal energy available to free electrons. This makes it harder for the electrons to move leading to an increase in resistance.
Question 4 of 10
What is the relationship between temperature and resistance in conductors generally due to?
In conductors, the increase in temperature increases atomic vibrations, which impede the flow of electrons, thereby increasing resistance.
Question 5 of 10
In the 'wedding hall' analogy for conductors, what represents the electrons?
The visitors in the wedding hall analogy represent the electrons within a conductor, which are responsible for carrying the current.
Question 6 of 10
What happens to electron flow in a conductor when temperature increases?
As temperature rises in a conductor, the increased atomic vibrations make it harder for electrons to flow, effectively reducing the current, hence increasing resistance.
Question 7 of 10
In the semiconductor analogy, what does an increase in temperature cause?
Increased temperature provides more energy, allowing electrons to move from the valence to conduction band, thus increasing free electrons and reducing resistance.
Question 8 of 10
What is the primary reason for a decrease in resistance in semiconductors as temperature increases?
The increase in temperature provides electrons with more energy, allowing them to escape their bonds and enter the conduction band, thus increasing the number of free electrons.
Question 9 of 10
How does the 'glass jar' analogy relate to insulators?
In insulators, the conduction band is approximately vacant, and as temperature increases, more space is available for electricity flow. This is like many exit doors (paths for electrons) for many guests (electrons), leading to reduced resistance.
Question 10 of 10
Which of the following materials generally exhibits a negative temperature coefficient of resistance?
Silicon is a semiconductor. Semiconductors have a negative temperature coefficient, meaning their resistance decreases as temperature increases.
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