Question

An insulated copper wire with a length of 1.2 m carries 20 A of current. The...

An insulated copper wire with a length of 1.2 m carries 20 A of current. The copper is 1 mm in diameter and the insulation (k=0.13 W/m. ºC) has a thickness of 0.8 cm. The wire has electrical resistance of 0.0321 Ω. Air at 25 ºC blows in crossflow over the wire to produce an external convective heat transfer coefficient of 219 W/m2. K. Assuming the copper is isothermal, find the copper temperature. Take the electrical resistivity of copper to be constant at 2.1 x 10-8 Ω.

Engineering   Mechanical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A thin metallic wall may be constructed using copper (properties are given in the table). The...
A thin metallic wall may be constructed using copper (properties are given in the table). The piping is required to have a radius r = 0.008 m and carries steam at 385 K. The wall is inside a room surrounded by air at a temperature of 298 K. The wall is insulated with a material (properties are given in the table). Properties Copper Insulation material Thermal Conductivity (W/m per ˚C) 385 0.071 Density (kg/m3) 8940 453 i. If the external...
(a) A teaching assistant is preparing for an in-class demonstration, using insulated copper wire and a...
(a) A teaching assistant is preparing for an in-class demonstration, using insulated copper wire and a power supply. She winds a single layer of the wire on a tube with a diameter of dsolenoid = 10.0 cm. The resulting solenoid is ℓ = 65.0 cm long, and the wire has a diameter of dwire = 0.100 cm. Assume the insulation is very thin, and adjacent turns of the wire are in contact. What power (in W) must be delivered to...
A 2.36-mm diameter copper wire (resistivity 1.68 × 10-8Ω∙m) carries a current of 15.6 A. What...
A 2.36-mm diameter copper wire (resistivity 1.68 × 10-8Ω∙m) carries a current of 15.6 A. What is the potential difference (in volts) between two points 194 m apart? A carbon resistor has a resistance of 19.17 Ω at a temperature of 21.1 °C. At what temperature (in °C) its resistance will drop to 12.93 Ω? (The temperature coefficient of resistivity for carbon is -5.0 × 10-4/C°.) A battery with an emf of 5.87 volts and an internal resistance 2.47 ohms...
2.1Consider a solid cylindrical rod of length 0.15 m and diameter 0.05 m. The top and...
2.1Consider a solid cylindrical rod of length 0.15 m and diameter 0.05 m. The top and bottom surfaces of the rod are maintained at constant temperatures of 20oC and 95oC, respectively, while the side surface is perfectly insulated. 2.1.1 Draw a diagram to represent the situation described above. (3) 2.1.2 Determine the rate of heat transfer through the rod if it is made of copper, k = 380 W/m? oC. (4) 2.1.3 Determine the rate of heat transfer through the...
A copper wire with diameter of 1,5 mm and length of 4m carries constant current of...
A copper wire with diameter of 1,5 mm and length of 4m carries constant current of 1.75 A. The free electron density in the wire is 8,5x1028 m-3. The resistivity of copper is 1,72x10-8 .m. Calculate   a) current density, b)drift velocity, c) magnitude of electric field, d) potential between the terminals of wire, e)power dissipated as heat f) mean free time. (mass of electron: 9,1x10-31kg, magnitude of charge of electron: 1,6x10-19 C)
A copper wire with diameter of 1,5 mm and length of 4m carries constant current of...
A copper wire with diameter of 1,5 mm and length of 4m carries constant current of 1.75 A. The free electron density in the wire is 8,5x1028 m-3. The resistivity of copper is 1,72x10-8 capital omega.m. Calculate a) current density, b)drift velocity, c) magnitude of electric field, d) potential between the terminals of wire, e)power dissipated as heat f) mean free time. (mass of electron: 9,1x10-31kg, magnitude of charge of electron: 1,6x10-19 C)
A 62.5 m length of insulated copper wire is wound to form a solenoid of radius...
A 62.5 m length of insulated copper wire is wound to form a solenoid of radius 1.7 cm. The copper wire has a radius of 0.49 mm. (Assume the resistivity of copper is ? = 1.7 ? 10?8 ? · m.) (a) What is the resistance of the wire? ? (b) Treating each turn of the solenoid as a circle, how many turns can be made with the wire? turns (c) How long is the resulting solenoid? m (d) What...
A 1.0 m length of copper wire has a cross-sectional area of 0.4x10-6 m2 and carries...
A 1.0 m length of copper wire has a cross-sectional area of 0.4x10-6 m2 and carries a current of 50 mA (a fairly typical amount of current). What is the current density magnitude in this wire? What is the electron drift speed in this wire? How long will It take for an electron to travel the length of the wire (traveling at the speed you just calculated)? What is the magnitude of the electric field inside the wire?
A 3.00-m length of copper wire at 20 ∘C has a 1.20-m-long section with diameter 1.2...
A 3.00-m length of copper wire at 20 ∘C has a 1.20-m-long section with diameter 1.2 mm and a 1.80-m-long section with diameter 0.60 mm . There is a current of 2.3 mA in the 1.2 mm -diameter section. (a) What is the current in the 0.60 mm -diameter section? (b) What is the magnitude of E⃗  in the 1.2 mm -diameter section? (c) What is the magnitude of E⃗  in the 0.60 mm -diameter section? (d) What is the potential difference...
An aluminum transmission line with a diameter of 20 mm has an electrical resistance of R'elec=...
An aluminum transmission line with a diameter of 20 mm has an electrical resistance of R'elec= 2.636 × 10-4 Ω/m and carries a current of 700 A. The line is subjected to frequent and severe cross winds, increasing the probability of contact between adjacent lines, thereby causing sparks and creating a potential fire hazard for nearby vegetation. The remedy is to insulate the line, but with the adverse effect of increasing the conductor operating temperature. (a) Calculate the conductor temperature...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT