Resistance Thermometers

Q. The electrical resistance in ohms of a certain thermometer varies with temperature according to the approximate law : R = Rₒ [1 + α (T – Tₒ )] The resistance is 101.6 W at the triple-point of water 273.16 K, and 165.5 W at the normal melting point of lead (600.5 K). What is the temperature when the resistance is 123.4 W

Q. The temperature coefficient of resistance of a wire is 0.00125 per ${}^{\circ }C$. At 300K its resistance is 1$\Omega$. The resistance of wire will be 2$\Omega$ at

1. 1100K
2. 1400K
3. 1127K
4. 1154K

Q. The resistance of a platinum resistance thermometer of ice point, the steam point and the boiling point of sulphur are 2.50, 3.50 and 6.50$\Omega$ respectively. Find the boiling point of sulphur on the platinum scale. The ice point and steam point measure $0^{\circ }$ and ${100}^{\circ }$ respectively.

1. ${400}^{\circ }$
2. ${500}^{\circ }$
3. ${600}^{\circ }$
4. ${700}^{\circ }$

Q. The resistance of a wire is $4.2\Omega$ at ${100}^{\circ }C$ and the temperature coefficient of the material is $0.004{/}^{\circ }C$. Its resistance at $0^{\circ }C$ is

Q. If I were to use measure changing temperature using a resistor, how would I do it?

1. Pass a current through the resistor and measure it. Change in current will give change in temperature.
2. Connect a battery across the resistor. The battery's supply voltage changes with temperature.
3. The resistor will change shape noticably for even small changes in temperature.
4. I'll just use a thermometer

Q.

The electrical resistance in ohms of a certain thermometer varies with temperature according to the approximate law:

R = R_o [1 + α (T – T_o)]

The resistance is 101.6 Ω at the triple-point of water 273.16 K, and 165.5 Ω at the normal melting point of lead (600.5 K). What is the temperature when the resistance is 123.4 Ω?