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A copper electric wire of radius R, = 1 mm is isolated by a layer of PVC so that the outer radius of the wire Rg = 2 mm, as shown in Figure below. The wire exchanges heat with the air at 20°C according to a heat transfer coefficient h=20 W/m2°c: Given that : k=copper electrical conductivity=4.0 × 1070hm-'m¯! kpvc= PVC thermal conductivity = 0.3- m°C kco = copper thermal conductivity = 100 m°C %3D (amp/m)² And that the electrical heating source is given by : S, amp²s /kgm³ If the temperature (T,) on the outer surface (r = RG) is 25°C, what is the electrical current C (amp) that passes through this wire? Dont forget to state your hypothesis clearly.

A copper electric wire of radius R, = 1 mm is isolated by a layer of PVC so that the outer radius of the wire Rg = 2 mm, as shown in Figure below. The wire exchanges heat with the air at 20°C according to a heat transfer coefficient h=20 W/m2°c: Given that : k=copper electrical conductivity=4.0 × 1070hm-'m¯! kpvc= PVC thermal conductivity = 0.3- m°C kco = copper thermal conductivity = 100 m°C %3D (amp/m)² And that the electrical heating source is given by : S, amp²s /kgm³ If the temperature (T,) on the outer surface (r = RG) is 25°C, what is the electrical current C (amp) that passes through this wire? Dont forget to state your hypothesis clearly.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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20°C Tair RF RG PVC insulation Copper wire
Transcribed Image Text:20°C Tair RF RG PVC insulation Copper wire
A copper electric wire of radius R, = 1 mm is isolated by a layer of PVC so that the outer radius of the wire Rg = 2 mm, as shown in Figure below. The wire exchanges heat with the air at 20°C according to a heat transfer coefficient h=20 W/m2°C: Given that : ke=copper electrical conductivity=4.0 × 1070hm-'m¬1 kpvc= PVC thermal conductivity = 0.3- m°C kco = copper thermal conductivity = 100 m°C (amp/m) And that the electrical heating source is given by : S. amp²s /kgm³ If the temperature (T,) on the outer surface (r = Rc) is 25°C, what is the electrical current C (amp) that passes through this wire? Dont' forget to state your hypothesis clearly.
Transcribed Image Text:A copper electric wire of radius R, = 1 mm is isolated by a layer of PVC so that the outer radius of the wire Rg = 2 mm, as shown in Figure below. The wire exchanges heat with the air at 20°C according to a heat transfer coefficient h=20 W/m2°C: Given that : ke=copper electrical conductivity=4.0 × 1070hm-'m¬1 kpvc= PVC thermal conductivity = 0.3- m°C kco = copper thermal conductivity = 100 m°C (amp/m) And that the electrical heating source is given by : S. amp²s /kgm³ If the temperature (T,) on the outer surface (r = Rc) is 25°C, what is the electrical current C (amp) that passes through this wire? Dont' forget to state your hypothesis clearly.
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