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What happens to the resistance of a material with a positive temperature coefficient when it is heated?
Positive Temperature coefficient indicates that the resistance of material INCREASES with rise in the temperature. Resistance Temperature COefficient(RTC) is defined as increase in resistance per unit original resistance per unit rise in temperature. Temperature Coefficient of Resistance=R2-R1/(R1*(T2-T1)) Where: R2:Resistance at temperature T2 R1:Resistance at temperature T1 SO from formula it is clear that if resistance increases with temperature(T2-T1>0 and R2>R1) then Difference R2-R1 will be positive hence RTC will have positive value. But if with increase in temperature(T2-T1>0) resistance decreases(R2<R1) then difference R2-r1 will be negative hence RTC will be negative.
What is the effect of temperature on resistance of different metals?
with increase temperature in metal, thermal energy causes atoms in metal to vibrate, in this excited state atoms interact with and scatter electrons, thus decreasing the mean free path, and hence the mobility of electrons to decreases and resistivity increase(Resistivity = 1 / Conductivity )so conductivity of metal decrease as increasing in temperature
What is temperature coefficient for insulator?
"Temperature coefficient" means, how does a certain physical quantity vary, depending on the temperature. In this case, the physical quantity in question is probably the electrical resistance, or the electrical resistivity.
What is the viscosity of platinum?
It doesn't have a viscosity at room temperature, it is solid
What is the temperature co-efficient of a resistance of a thermister?
The temperature coefficient of a thermistor is a measure of how much its resistance changes with temperature. It is typically expressed in units of percent resistance change per degree Celsius. Negative temperature coefficients mean the resistance decreases as temperature increases, while positive coefficients mean the resistance increases with temperature.
The lowest temperature coefficient metal is?
The metal with the lowest temperature coefficient is Platinum. Its temperature coefficient of resistance is among the lowest of all metals, making it a preferred choice for applications where stability in resistance over a wide temperature range is required.
If the temperature of a metal conductor increases the electrical resistance of the conductor usually?
increases
Is cold metal a better conductor of electricity than warm metal?
In hot metals the kinetic energy of electrons becomes higher and they move randomly so their movement in one direction becomes decreased so the conductance becomes decreased.
What Determines the exact temperature of the shielded metal welding arc?
It depends on the resistance to the current flow
What determines the exact temperature of the shield metal welding arc?
It depends on the resistance to the current flow
How does the resistance of a transformer vary?
The resistance of a transformer primarily refers to the resistance of its windings, which is typically fixed and does not change significantly under normal operating conditions. However, the effective impedance seen by the primary or secondary side can vary based on load conditions and frequency. Additionally, factors such as temperature changes can affect the resistance of the windings, as resistance generally increases with temperature. Overall, while the intrinsic resistance remains constant, the apparent resistance can vary due to external factors.
What happens to the resistance of a material with a positive temperature coefficient when it is heated?
Positive Temperature coefficient indicates that the resistance of material INCREASES with rise in the temperature. Resistance Temperature COefficient(RTC) is defined as increase in resistance per unit original resistance per unit rise in temperature. Temperature Coefficient of Resistance=R2-R1/(R1*(T2-T1)) Where: R2:Resistance at temperature T2 R1:Resistance at temperature T1 SO from formula it is clear that if resistance increases with temperature(T2-T1>0 and R2>R1) then Difference R2-R1 will be positive hence RTC will have positive value. But if with increase in temperature(T2-T1>0) resistance decreases(R2<R1) then difference R2-r1 will be negative hence RTC will be negative.
What do you expect of ohmic resistance as you increase or reduce temperature?
It depends. In general, pure metal conductors increase in resistance as their temperature increases; some alloys (e.g. constantan) are manufactured to maintain an approximately-constant resistance for changes in temperature. Materials such as carbon (and most insulators) exhibit a fall in resistance as their temperatures increase.
How the resistance of conducting material vary with temperature?
Well, there's typically two types of materials-Those with positive temperature coefficient and those with negative temperature coefficient. Positive temperature coefficient are those whose resistance increases as temperature increases. Negative temperature cofficient are those whose resistance decrease when the temperature increase. There are however some alloys such as Manganin& Constantan whose resistance is not affected by temperature
How is the resistance of a metallic conductor affected by variation in temperature?
In general, pure metal conductors increase in resistance as their temperature increases. This is not necessarily true for alloys, as some alloys are manufactured to have an approximately constant resistance over a wide range of temperatures.
What is the effect of temperature on resistance of different metals?
with increase temperature in metal, thermal energy causes atoms in metal to vibrate, in this excited state atoms interact with and scatter electrons, thus decreasing the mean free path, and hence the mobility of electrons to decreases and resistivity increase(Resistivity = 1 / Conductivity )so conductivity of metal decrease as increasing in temperature
What is the basic principles of temperature RTD?
The basic principle of a Resistance Temperature Detector (RTD) is that the electrical resistance of a metal changes with temperature. Typically made from pure platinum, the RTD exhibits a predictable and nearly linear increase in resistance as temperature rises. This change in resistance can be measured and converted into a temperature reading using calibration equations. RTDs are known for their accuracy and stability, making them suitable for precision temperature measurements in various applications.
