EmSAT Achieve Exam > EmSAT Achieve Videos > Physics for EmSAT Achieve > Resisitivity & its Temperature Dependence
Resisitivity & its Temperature Dependence Video Lecture | Physics for EmSAT Achieve
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FAQs on Resisitivity & its Temperature Dependence Video Lecture - Physics for EmSAT Achieve
| 1. What is resistivity and how does it relate to temperature? |  |
Ans. Resistivity is a measure of a material's ability to resist the flow of electric current. It is denoted by the symbol ρ and is directly related to the temperature of the material. As temperature increases, the resistivity of most materials also increases. This means that the material becomes more resistant to the flow of electric current as it gets hotter.
| 2. What factors determine the resistivity of a material? | |
Ans. The resistivity of a material is determined by several factors, including the type of material, its atomic structure, and the temperature. Different materials have different resistivities due to variations in their atomic properties. For example, metals generally have lower resistivities compared to non-metals. Additionally, the presence of impurities or defects in the material can also affect its resistivity.
| 3. Why does resistivity increase with temperature? | |
Ans. The increase in resistivity with temperature can be explained by the scattering of electrons. As temperature rises, the atoms in the material vibrate more vigorously, causing increased collisions between the electrons and the vibrating atoms. These collisions disrupt the flow of electrons, leading to an increase in resistivity. This phenomenon is known as the temperature dependence of resistivity.
| 4. Are there any materials that show a decrease in resistivity with temperature? | |
Ans. Yes, there are some materials that exhibit a decrease in resistivity with increasing temperature. These materials are known as thermistors and are typically made from semiconductor materials. Unlike most materials, the resistivity of thermistors decreases as temperature rises. This property makes them useful in applications where temperature sensing or temperature compensation is required.
| 5. How is the temperature dependence of resistivity useful in practical applications? | |
Ans. The temperature dependence of resistivity is utilized in various practical applications. One common use is in the design and calibration of temperature sensors. By using materials with known resistivity-temperature relationships, accurate temperature measurements can be obtained. Additionally, this property is also exploited in devices like thermal fuses, which utilize changes in resistivity to protect against overheating.
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Nov 22, 2024 Last updated |
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