A 1.70 m cylindrical rod of diameter 0.450 cm is connected to a power supply that maintains a constant potential difference of 15.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0 degree Celsius ) the ammeter reads 18.7A , while at 92.0 degree Celsius it reads 17.2 A . You can ignore any thermal expansion of the rod.
Find the resistivity for the material of the rod at 20 degree celsius.
p= _______ ohms m.
Find the temperature coefficient of resistivity at 20 deg. Celsius for the material of the rod.
X = _______ deg C^-1.
What is the resistance of a Nichrome wire at 0.0 deg. Celsius if its resistance is 180.00 ohms at 11.5 deg. Celsius? Temperature coefficient for Nichrome is .0004
R= ________ ohms.
What is the resistance of a carbon rod at 25.8 deg Celsius if the resistance is 0.0140 ohms at 0.0 deg. Celsius? Temperature coefficient for carbon is -.0005
R = _________ ohms.
Solution Summary
The expert examines thermal coefficient of resistance. Thermal expansion of the rods are determined. The expert finds the resistivity of the material of the rod.
... that the surface heat transfer coefficients remain the ... b) the thermal conductivity of felt is 0.05 W/mK ... c) the outside surface heat transfer coefficient is 20.0 ...
... So heat transfer per unit area = 0.3* 0.1 = 0.03 MW/m2 Q = 30000 W/m2 We know that Q = ∆T/R Where R = thermal resistance Heat transfer coefficient in fluid ...
... temperature coefficient of resistance. So, when a current flows through the filament of an incandescent light bulb, its temperature increases (Thermal effect ...
... volume of a liquid The change in length of a metal rod The change in electrical resistance of a ... In fact, the volumetric coefficient of thermal expansion is ...
... However, as the temperature increases, the thermal kinetic energy of the ... we define a quantity known as temperature coefficient of resistance as the ...
... of a liquid c.) The change in length of a metal rod d.) The change in electrical resistance of a ... In fact, the volumetric coefficient of thermal expansion is ...
... is significant, heat and mass transfer coefficients are typically ... heater has a significant thermal capacitance and ... h = film heat transfer coefficient for the ...
