A length of platinum wire is connected to a constant voltage source and a current of 0.6 A is precisely measured at a temperature of 48°C. The temperature of the wire increases and later the current is 0.53 A. Determine the temperature of the wire when the current is 0.53 A. For platinum, α = 0.003927 °C1 at 20°C. 48.7 °C
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- 1.The resistance of a thermistor over a limited range of temperature is given by where c is a constant and T is the absolute temperature. What will be the temperature on the Celsius scale of the thermistor at absolute temperature of T = 300K? 2. A woman finds a front windshield of a car covered with ice at -12oC. The ice mm and the windshield area is 125mm2. The density of the ice is 917kg/m3. How much heat is required to melt the ice? [S.H.C of ice = 2200J/kg/K, Lf =3.3x105J/kg]. 3. An electric heater of power 2kW is used to heat 0.8kg of water in a container of heat capacity 300J/K. If the water is initially at 18oC, how long will it take to heat it to the boiling point of 100oC? What mass of water will have boiled away in 4 minutes? [S.H.C of water = 4200J/kg/K, LV = 2.3X106J/kg] 4. Explain anomalous expansion of water. 5. Steel railway tracks are laid at 8oC. What size of expansion gap are needed 10m long rail sections if the ambient temperature varies from -10oC to…A copper-constantan thermocouple generates a voltage of 4.75 x 10-3 volts when the temperature of the hot junction is 110 °C and the reference junction is kept at 0 °C. If the voltage is proportional to the difference in temperature between the junctions, what is the temperature in degrees Celsius of the hot junction when the voltage is 2.35 x 10-3 volts? Number i UnitsA copper-constantan thermocouple generates a voltage of 4.75 x 10-3 volts when the temperature of the hot junction is 110 °C and the reference junction is kept at 0 °C. If the voltage is proportional to the difference in temperature between the junctions, what is the temperature in degrees Celsius of the hot junction when the voltage is 2.45 x 10-³ volts? Number i eTextbook and Media GO Tutorial Units ✪
- A copper-constantan thermocouple generates a voltage of 4.75 x 10-3 volts when the temperature of the hot junction is 110 °C and the reference junction is kept at 0 °C. If the voltage is proportional to the difference in temperature between the junctions, what is the temperature in degrees Celsius of the hot junction when the voltage is 1.60 x 10-³ volts? Number i Units ↑The table below gives the results of measuring the electrical conductivity C of glass at temperature T degrees Fahrenheit. 86 148 166 188 202 210 0.004 0.018 0.029 0.051 0.073 0.090 Use regression to find the exponential function C=ae bT that will satisfy the given table. Find the value of Cif T = 197.1.Presents the diagram of the problem, necessary formulas, clearance and numerical solution: A poorly designed electronic device has two screws attached to different parts of the device that almost touch each other inside. steel bolts and brass are at different electrical potentials and if they touch, a short circuit will develop will damage the device. The initial separation between the ends of the screws is 5 μm to 27 ◦C. At what temperature will the screws touch? Assume that the distance between the walls of the device is not affected by temperature change and the coefficient coefficients of linear expansion αlaton = 19x10−6 ◦C −1 and αsteel = 11x10−6 ◦C −1
- You are insulating a metal pipe carrying a hot fluid. The outside Diameter of the pipe is 3.5 cm, and the pipe has a length of 7.7 meters. Due to the fluid inside the pipe, the outside surface of the metal fluid pipe is kept at a constant temperature of 85.0°C. The metal pipe is inserted inside of a thin-wall circular tube, which has an inside diameter of 11.2 cm (ignore the resistance of the thin-wall circular tube). The space between the outside of the hot metal pipe and the inside of the thin-wall circular tube is filled with foam insulation, k = 0.036 W/m-K. The outside of the thin-walled circular tube is kept at a constant temperature of 28.0°C. Due to a manufacturing error, the metal pipe was not centered inside the thin-wall tube when the foam insulation was added, but was instead installed with an eccentricity of 2.0 cm (i.e. the center of the metal pipe is 2.0 cm distance from the center of the thin-walled circular tube). Calculate the increase in the heat transfer rate due to…You have a pure copper electrical wire with a diameter of 0.205cm and an electrical resistance of 0.0053Ω/m. The wire is exposed to uniform convection of T_inf = 22.0°C, h_inf = 15.0 W/(m2-K). At steady-state conditions the wire carries 21.0 amps of current through it. Determine both the surface temperature and the maximum temperature of the wire.A copper rod, an aluminum rod, and a brass, each 6.00 m in length and 1.00 cm in diameter, are placed end to end with the aluminum rod between the other two. The free end of the copper rod is maintained at the water’s boiling point, and the free end of the brass rod is maintained at the water’s freezing point. If T1 and T2 are steady-state temperature copper-aluminum junction and aluminum-brass junction respectively. Where TC is the temp at the freezing point of water and TH is the temp at the boiling point of water. Show that the steady-state temperature for (a) the copper-aluminum junction and (b) the aluminum-brass junction are the following. Picture T1 is for the copper-aluminum junction. Picture T2 is for the aluminum-brass junction.
- A copper-constantan thermocouple generates a voltage of 4.75 x 10-3 volts when the temperature of the hot junction is 110 °C and the reference junction is kept at 0 °C. If the voltage is proportional to the difference in temperature between the junctions, what is the temperature in degrees Celsius of the hot junction when the voltage is 2.08 x 10-3 volts?A copper rod, an aluminum rod, and a brass, each 6.00 m in length and 1.00 cm in diameter, are placed end to end with the aluminum rod between the other two. The free end of the copper rod is maintained at the water’s boiling point, and the free end of the brass rod is maintained at the water’s freezing point. If T1 and T2 are steady-state temperature copper-aluminum junction and aluminum-brass junction respectively. Where TC is the temp at the freezing point of water and TH is the temp at the boiling point of water. Show the derivation of the equation in picture A and picture B for computing its steady-state temperature of copper-aluminum junctionaluminum-brass junction respectively.A copper rod, an aluminum rod, and a brass, each 6.00 m in length and 1.00 cm in diameter, are placed end to end with the aluminum rod between the other two. The free end of the copper rod is maintained at the water’s boiling point, and the free end of the brass rod is maintained at the water’s freezing point. If T1 and T2 are steady-state temperature copper-aluminum junction and aluminum-brass junction respectively. Where TC is the temp at the freezing point of water and TH is the temp at the boiling point of water. Show the derivation of the equation in picture A and picture B for computing its steady-state temperature of copper-aluminum junctionaluminum-brass junction.
