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We usually think of wires as perfect (R=0) conductors, which is not quite accurate. Real wires have resista albeit small - usually less than an ohm. With this in mind: a. Consider a uniform cylindrical copper wire that has diameter of 1 mm and is 10 m long. What is resistance of this wire? The resistivity of copper is 1.72 x 10-8 №-m. b. This wire is cut in half, and the two strands are used to connect an electric heater to an ou supplying 1500 W at 120 V. Draw a simple circuit diagram, including the voltage source, resistan of the connector wires, and the calculated resistance for the heater. How much of the total 1500 W is absorbed by the connector wires, not by the electric heater? C.

We usually think of wires as perfect (R=0) conductors, which is not quite accurate. Real wires have resista albeit small - usually less than an ohm. With this in mind: a. Consider a uniform cylindrical copper wire that has diameter of 1 mm and is 10 m long. What is resistance of this wire? The resistivity of copper is 1.72 x 10-8 №-m. b. This wire is cut in half, and the two strands are used to connect an electric heater to an ou supplying 1500 W at 120 V. Draw a simple circuit diagram, including the voltage source, resistan of the connector wires, and the calculated resistance for the heater. How much of the total 1500 W is absorbed by the connector wires, not by the electric heater? C.

Introductory Circuit Analysis (13th Edition)
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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4) We usually think of wires as perfect (R=0) conductors, which is not quite accurate. Real wires have resistance albeit small - usually less than an ohm. With this in mind: a. Consider a uniform cylindrical copper wire that has diameter of 1 mm and is 10 m long. What is the resistance of this wire? The resistivity of copper is 1.72 x 10-8 9-m. b. This wire is cut in half, and the two strands are used to connect an electric heater to an outlet supplying 1500 W at 120 V. Draw a simple circuit diagram, including the voltage source, resistances of the connector wires, and the calculated resistance for the heater. C. How much of the total 1500 W is absorbed by the connector wires, not by the electric heater? d. If the specific heat and density of copper are 385 J/kg°C and 8940 kg/m³ respectively, how much will the connector wires heat up after 1 minute of use? (Assume all energy absorbed by the connector wires is converted to heat and remains in the copper wire.) Remember that E cmAT, where c is specific heat, mis mass, and AT is the change in temperature. =
Transcribed Image Text:4) We usually think of wires as perfect (R=0) conductors, which is not quite accurate. Real wires have resistance albeit small - usually less than an ohm. With this in mind: a. Consider a uniform cylindrical copper wire that has diameter of 1 mm and is 10 m long. What is the resistance of this wire? The resistivity of copper is 1.72 x 10-8 9-m. b. This wire is cut in half, and the two strands are used to connect an electric heater to an outlet supplying 1500 W at 120 V. Draw a simple circuit diagram, including the voltage source, resistances of the connector wires, and the calculated resistance for the heater. C. How much of the total 1500 W is absorbed by the connector wires, not by the electric heater? d. If the specific heat and density of copper are 385 J/kg°C and 8940 kg/m³ respectively, how much will the connector wires heat up after 1 minute of use? (Assume all energy absorbed by the connector wires is converted to heat and remains in the copper wire.) Remember that E cmAT, where c is specific heat, mis mass, and AT is the change in temperature. =
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