Physics, 26.02.2020 17:29 nalanisancruzado
Power in an Electric Heater An electric heater is constructed by applying a potential difference of 120 V across a Nichrome wire that has a total resistance of 8.10 Ω. Find the current carried by the wire and the power rating of the heater. SOLUTION Conceptualize As discussed in the example The Resistance of a Nichrome Wire, Nichrome wire has high resistivity and is often used for heating elements in toasters, irons, and electric heaters. Therefore, we expect the power delivered to the wire to be relatively Correct: Your answer is correct. . Categorize We evaluate the power from P = I2R = (ΔV)2 R , so we categorize this example as Correct: Your answer is correct. problem. Analyze Use this equation to find the current (in A) in the wire: I = ΔV R = 14.1 Incorrect: Your answer is incorrect. A Find the power rating (in kW) using the expression P = I2R: P = I2R = 1.69 Incorrect: Your answer is incorrect. kW EXERCISE Consider a heater rated at 120 V with power 3.2 kW. Hint (a) What is the resistance of the heater (in Ω), and the current (in A) when it is under normal operation? R = Ω I = A (b) If we connect it a 240 V source, assuming that it still works, what will be the actual power consumption now (in kW)? kW
Answers: 2
Physics, 22.06.2019 08:20, jrjordans13ox06qs
At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?
Answers: 1
Physics, 22.06.2019 12:50, starr3971
Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.
Answers: 2
Power in an Electric Heater An electric heater is constructed by applying a potential difference of...
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