A long wire with a radius of 0.400 cm carries a current. The potential difference across a 3.40 m long section of this wire is 15.0 V, and the wire carries a current of 0.450 A. (a) What is the resistance (in Ω) of the 3.40 m long section of wire? Ω (b) What is the resistivity (in Ω · m) of the wire? Ω· m

A long wire with a radius of 0.400 cm carries a current. The potential difference across a 3.40 m long section of this wire is 15.0 V, and the wire carries a current of 0.450 A. (a) What is the resistance (in Ω) of the 3.40 m long section of wire? Ω (b) What is the resistivity (in Ω · m) of the wire? Ω· m

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 8P: A 0.900-V potential difference is maintained across a 1.50-m length of tungsten wire that has a...

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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

Question

A long wire with a radius of 0.400 cm carries a current. The potential difference across a 3.40 m long section of this wire is 15.0 V, and the wire carries a current of 0.450 A.

(a)

What is the resistance (in Ω) of the 3.40 m long section of wire?

Ω

(b)

What is the resistivity (in Ω · m) of the wire?

Ω· m

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