A resistance oven employing nichrome wire is to beoperated from 220 V single phase supply and is to be rated at 16 kW.If the temperature of the element is to be limited to 1170 °C andaverage temperature of the charge is 500 °C, find the diameter and= 0.57,length of the element wire. Radiating efficiencyEmissivity=0.9, Specific resistance of nichrome = 1.09 x 10-6-m.

Answered: Image /qna-images/answer/7520b159-f134-4a04-807c-617a7584b74c.jpg

Answered: A resistance oven employing nichrome…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Similar questions

An 18-gauge copper wire with a diameter of 1-mm carries a constant current of 1-A. The charge concentration in the wire is 8.5 x 1028 per cubic meter. Determine the electric field in mN/C. Use q = 1.602 x 10-19 and resistivity equal to 1.72x10-8 ohm-m.
b. A piece of pencil lead is connected in series with an ammeter and a power supply. The power supply is turned on. After a few minutes, although the potential difference across the pencil lead does not change, the current in the circuit increases significantly. Explain why the current increases. c. Electric fields are caused by both point charges and by parallel plates with a potential difference across them. Describe the difference between the electric field caused by a point charge and the electric field between parallel plates. Your answer should include a diagram of each type of field and reference to electric field strength. Question 2
How is the surface layer of silicon dioxide formed? how thick is this layer? what are the reasons for forming the Silicon dioxide layer?
We want to investigate how the field strength will be with air as dielectric and with steatite. A plate capacitor is placed in a 24 kV network between phase and ground. The relative permittivity of air is &=1 and for steatite &-6. The plate capacitor has area = 1m². The distance between the electrodes is 2 mm. Ep = 8.854-10-12 F/m A=1m² d=2mm a) Calculate the maximum field strength in the plate capacitor. (Answer: 9.8kV/mm) b) What is the capacitance of the capacitor if we use steatite? (Answer: C = 26.6nF)
A certain batch of copper wire was found to have a conductivity of 98% at 20°C. What is its resistivity in u0-cm?
A series circuit is set up with an AA battery along with an mystery material and ammeter; however, there’s no current passing through. A.Insulator B.Conductor C.Semiconductor
Using the idea of energy bands in solid materials, explain the characteristics of the followingmaterialsa) conductorsb) insulatorsc) semiconductors
An 18-gauge copper wire with a diameter of 1-mm carries a constant current of 1-A. The charge concentration in the wire is 8.5 x 1028 per cubic meter. Determine the resistance, in ohms, of a 77-m wire in milli-ohm. Use resistivity equal to 1.72x10-8 ohm-m.
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.
The primary voltage on the transformer in Figure 2–46 (p. 96) is 120 V rms and NP : NS = 15:1. Diode voltage drops are 0.7 V. (a) What should be the value of RL if the average current in RL must be 0.5 A? (d) Is it alright to measure with an oscilloscope both the input and output waveforms at the same time in Figure 2-46? Why or why not?
Compare the dependence on temperature for electrical conductivity in metals and semiconductors intrinsic, explaining the difference in behavior.
A silver wire has conductance of 0.25 Siemens. What will be the resistance of a copper wire having a diameter one third and length quarter of the silver wire? The specific conductivity of silver is 60 times that of copper.

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