(3) A thick silver wire resistance heater measures 2 m in length with a diameter of 2.5 cm. The power output of the wire is 400 watts. If the maximum temperature in the wire is 800 K, what is the temperature of the wire at r = cm? 2 L=2m 0.75 • Q = Egen = 400 W wire d = 2.5cm = 0.025m R = 0.0125m Tmax=800k = T (r = 0) T(r = 0.0075m) = ? R
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- 1. For tonight's dinner, you have decided to cook a piece of salmon fillet in the oven. Shortly before dinner started, the salmon fillet was removed from the freezer (where it had been kept for a week) and placed into the oven (which was preheated to an air temperature T1), as shown in Figure 1. A timer was then started (t = 0) to keep track of the cooking time. Assume that the thermal capacitance of the salmon fillet is mC J/K and the oven is very large compared 00000000 Salmon fillet at temperature T to the salmon fillet and insulated. Oven at air temperature T1 a) What simplifying assumption can be made pertaining to the effect of the room temperature on the air temperature in the oven? What is the title or general description given to this type of simplifying assumption? Room at temperature TR Figure 1: Salmon fillet in ovenA certain toaster has a heating element made of Nichrome resistance wire. When the toaster is first connected to a 120 V source of potential difference (and the wire is at a temperature of 20.0°C), the initial current is 1.90 A, but the current begins to decrease as the resistive element warms up. When the toaster reaches its final operating temperature, the current has dropped to 1.5 A. (d) Determine the operating temperature of the heating element.Q1: A copper cable is 2 km long and has across-sectional area of 10 mm². Find its resistance at 80°C if at 20C the resistivity of copper is 0.02x10-6 2.m and its temperature coefficient of resistance is 0.004/•C.
- The Subject is Basic Electrical EngineeringSelect the correct statement for a radial conductivity exp Select one: a. The mid outer surface represent the heating area while the side surface represent the cooling area b. None of them is true c. The inner section represent the heating area and the outer section represent the cooling area d. The outer section represent the heating area and the inner section represent the cooling areaA heating element made of tungsten wire connected to a large battery that has negligible internal resistance. When the heating element reaches 80.0°C, it consumes electrical energy at a rate of 480 W. Assume that the temperature coefficient of resistivity has the value given in Table 25.2 in the textbook and that it is constant over the temperature range in this problem. In the equation R(T) = Ro [1 + a(T - To)] take To to be 20.0°C. Part A What is its power consumption when the temperature of the heating element is 110.0°C? Express your answer with the appropriate units. P = Submit Value Provide Feedback Request Answer Units ?
- Determine the resistance of an aluminium coil of 1.3 cm as diameter consists of 13100 turns and the mean length per turn is 44 cm. Take the electrical resistivity aluminium coil as 0.017 μΩ–m. The area in cm2 = The total length in m = The resistance of the coil in Ω =Choose the right answerA resistance-capacitance relaxation circuit is used in an electrical discharge machining process. The discharge voltage is 100 V. At a spark cycle time of 25 µs, the average Power input required is 1 kW. The capacitance (in μF) in the circuit is
- Find the total heat flux of the composite wall when: B F KA = KC = KF = 15 т. К A E KB = KD = 10 т. К KE = KG = 20 т. К D. Height of B = C = D 4 cm 3 cm 4 cm 6 cm Height of F = G AT = 30 K て)A coil consists of 2000 turns of copper wire having a circular - section of diameter 2.5 mm. The mean length per turn is 80 cm and the electrical resistivity of copper is 0.02 μΩ–m. Determine the resistance of the coil.30_ Select the correct statement for a radial conductivity exp Select one: a. The mid outer surface represent the heating area while the side surface represent the cooling area b. None of them is true c. The outer section represent the heating area and the inner section represent the cooling area d. The inner section represent the heating area and the outer section represent the cooling area 24_ The device with highest static head loss is Select one: a. No static head loss in this experiment b. Venturi meter c. Orifice plan d. Rotameter 26_ If surface is not leveled under the center of pressure tank Select one: a. Legs of the device can be rotated to create level surface b. Items should be added under the device to create level surface c. The device has and auto leveling d. none