Variation of Resistance and Resistivity with Temperature

The conductivity of a material varies with temperature for (i) semiconductors and (ii) good conductors as

Why temperature coefficient of resistance of conductor is positive?

Thermistors have __________

The temperature coefficient of resistance of a semiconductor

The temperature coefficient of resistance of a wire is $0.00125 /°\mathrm{C}$ . At $300 \mathrm{K}$, its resistance is $1 \mathrm{\Omega }$. The resistance of wire will be $2 \mathrm{\Omega }$ at

Consider the statements A and B in the previous question. Peltier effect is caused

A wire has a resistance of $2.5\mathrm{ }\mathrm{\Omega }$ at $28\mathrm{ }{ }^{\mathrm{o}}\mathrm{C}$ and a resistance of $2.9\mathrm{ }\mathrm{\Omega }$ at $100\mathrm{ }{ }^{\mathrm{o}}\mathrm{C}$ . The temperature coefficient of resistance of material of the wire is $2.22\times {10}^{-2} {}^{\mathrm{o}}\mathrm{C}^{-1}$.

Find the temperature at which the resistance of a material is doubled that of the resistance at $\left(0° \mathrm{C}\right)$. The temperature coefficient of the material of resistance is $4.0\times {10}^{-3} {\mathrm{C}}^{-1}$.

At room temperature $\left(27° \mathrm{C}\right)$, the resistance of a heating element is $100 \mathrm{\Omega }$. What is the temperature of the element if the resistance is found to be $117 \mathrm{\Omega },$ given that the temperature coefficient of the material of resistance is $1.70\times {10}^{-4} {\mathrm{C}}^{-1}$.

Write the names of two materials whose resistivity decreases on increasing the temperature.

Give the dependence of resistivity on temperature of a conductor.

A conducting resistance is connected to a battery. The temperature of the conductor decreases due to cooling. The current flowing through the resistance will -

A piece of Gold (Au) and Germanium (Ge) are cooled from room temperature to 77 K. Then the resistance of

A sliver wire has a resistance of $2.1 \mathrm{\Omega }$ at $27.5{}^o\mathrm{C}$ and a resistance of $2.7\mathrm{\Omega }$ at ${100 }^o\mathrm{C}.$ Determine the temperature coefficient of resistivity of silver.

The temperature coefficient of resistance of a manganin wire is $0.002$ per degree centigrade and its resistance is $7.6 \mathrm{o}\mathrm{h}\mathrm{m}$ at $300 \mathrm{K}.$ When a potential is applied, its temperature increases to ${77 }^o\mathrm{C}.$ Now what will be its resistance?

Variation of resistance of the conductor with temperature is as shown. Temperature coefficient of the conductor is

If copper and silicon pieces are heated, the resistance of

A wire of Aluminium and a wire of Germanium are cooled to a temperature of ${77}^{o}K$ . Then

Resistivity of a resistor at a temperature $T$ is given by the relation:

$\rho \left(T\right)={\rho }_0\left[1+\alpha \left(T-T_0\right)\right]$

Where $\alpha$ is the temperature coefficient of resistivity, ${\rho }_0$ is resistivity at initial temperature $T_0$

Find the resistance of the wire at ${30}^{o }C,$ if at $5^{o}C,$ the resistance of same wire is $200\mathrm{\Omega } and at {10}^{o}C,$ the resistance of same wire is $200.2 \mathrm{\Omega }$