) Calculate the temperature coefficient of resistance of aluminum at 2°C. (b) Using the value thus obtained, determine the resistance of an aluminum conductor at 62°C if it's resistance at 2°C is 7.5 ohms.
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(a) Calculate the temperature coefficient of resistance of aluminum at 2°C. (b) Using the value thus obtained, determine the resistance of an aluminum conductor at 62°C if it's resistance at 2°C is 7.5 ohms.
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- Graphically show the effect of changes in temperature on the resistance of conductors, semiconductors, and insulators.Discuss the variation of resistivity with temperature for insulators, semiconductors and conductors. Support your discussion with resistivity versus temperature graph/curvesA two wires, one of Copper and the other of Nickel, if the resistance of the first is (12.7 Q), and the second is (11.6 0) at room temperature, at what temperature are their resistances equal? Note that the temperature coefficient of resistivity of Copper is (0.0039 C-1), and for Nickel it is equal to (0.006 C1).
- Determine the thermal coefficient of resistance of copper at 50°C, then use this value todetermine the resistance of copper wire at 170° if the resistance of this copper wire at 50°C is50ohms. The thermal coefficient of resistance of copper at O°C is 0.004264/C°Determine the conductance at 20°C of an Aluminum bar 0.5 inch thick, 3.5 inches wide and 10ft. long. The conductivity of Aluminum is 70% that of copper and copper has a conductivity of 600,000 mho/cm at 20°C.A wire has a circular cross-section of radius r= 3.53 mm. The conductivity of the wire is 1x10^5 (Ohm, meter) and its lengthis 2m. The total resistance of the wire in Ohms is:O a. 0.51O b. 0.72ç. 0.26O d. 5136.07O e. 797497.60
- 2. When a current of 1A flows through a wire, the drift velocity of the electrons is 0.9 mm/s. What will be the drift velocity of the electrons when a 2A current flows through another wire of the same material having double the length and double the area of cross section and same temperature.Nichrome ribbon resistor elements each has a resistance of 1 ohm. The element is made from sheet of nichrome alloy, 0.025 cm think. If the width of the ribbon is 0.3cm, what length is required per element in cm? Assume specific resistance of nichrome alloy to be 109microOhm-cm.A resistor has a resistance of 43.6 ohm at 20°C and 50.8 ohm at 60°C. Determine the temperature coefficient of resistance of aluminium at 0°C, its resistance at 0°C and at 40°C.
- Question 3 a. Some materials exhibit the property of superconductivity under certain conditions. State what is meant by superconductivity and explain the required conditions for the material to become superconducting. b. The diagram below shows the cross-section of a cable consisting of parallel filaments that can be made superconducting, embedded in a cylinder of copper. copper cylinder filament The cross-sectional area of the copper in the cable is 2.28 x 10-7 m². The resistance of the copper in a 1.0 m length of the cable is 0.075 N. Calculate the resistivity of the copper, stating an appropriate unit. State and explain the what happen to the resistance of the cable when the embedded filaments of wire are made superconductive? i.Compare the dependence on temperature for electrical conductivity in metals and semiconductors intrinsic, explaining the difference in behavior.The resistance of wire increases from 40 – ohm at 20 0C to 50 – ohm at 70 0C. Find the temperature coefficient of resistance at 0 0C.