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The temperature coefficient of copper is positive because as temperature increases, the resistance of copper also increases. This is due to the increased vibrations of copper atoms at higher temperatures, leading to more collisions with free electrons and hindering the flow of electric current.
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What is the value heat transfer coefficient of copper?
The heat transfer coefficient of copper is typically around 400 W/m^2K. This value can vary depending on factors such as temperature, surface roughness, and fluid flow conditions.
When a sample of germanium and silicon having same impurity density are kept at room temperature then resistivity of both?
The resistivity of germanium will decrease with increasing temperature due to a positive temperature coefficient of resistivity, while the resistivity of silicon will increase with increasing temperature due to a negative temperature coefficient of resistivity. At room temperature, silicon will have a higher resistivity compared to germanium.
Why aluminum has high thermal expansion coefficient than Copper?
Aluminum has a higher thermal expansion coefficient than copper because its crystal structure allows for larger atomic movements when heated. This results in a greater expansion of aluminum compared to copper when exposed to heat. Additionally, aluminum has a lower density and stronger interatomic bonds, leading to a higher degree of expansion when heated.
What is copper's phase at room temperature?
Copper is a solid at room temperature.
What is the colour of copper sulphate at room temperature?
Copper sulfate is typically blue in color at room temperature.
What is the relationship between resistance and temperature?
• ntc 'negative temperature coefficient': its resistance decreases as the temperature increases• ptc 'positive temperature coefficient': its resistance increases as the temperature increases
Does a safe reactor have a positive or negative 'temperature coefficient of reactivity'?
negative 'temperature coefficient of reactivity'
Fullform of ntc and ptc?
ntc: negative temperature coefficient ptc: positive temperature coefficient
What is the temperature coefficient of an extrinsic semiconductor is?
positive
What is the difference between positive and negative temperature coefficient of resistance?
Negative temperature coefficient of resistance means that as the temperature of a piece of wire or a strip of semiconducting material increases, the electrical resistance of that material decreases.
What is the temperature coefficient of extrinsic semiconductor?
positive
What happens when the temperature of a forward biased diode is increased?
What happens depends on the temperature coefficient of the diode. If that diode has a positive temperature coefficient, it resistance increases with increased temperature. A diode with a negative temperature coefficient does the opposite.
What Materials that have positive temperature coefficient?
Some materials with a positive temperature coefficient of resistance include silicon, germanium, and thermistors made of certain metal oxides like manganese, cobalt, and copper. These materials exhibit an increase in resistance with an increase in temperature, making them useful in temperature-sensing applications.
What is the difference between PTC and NTC resistors?
positive temperature coefficient vs. negative temperature coefficient resistance increases or decreases with increase of temperature, respectively.
Why do conductor have a positive coefficent?
You mean positive temperature coefficient? Yes conductors as they get heated then due to the nucleii vibrating with greater amplitude would have a grip over the moving electrons and so the resistivity increases with the increase in temperature. Hence positive temperature coefficient.
What does the acronym PTC mean?
1) Positive Temperature Coefficient 2) Positive Train Control.
What materials have positive temperature coefficient?
the materials are silver, aluminum, gold.
