A wire has a diameter of D=0.95 cm and is L=85 m long. When connected to a V=21 V source the wire...

Question:

A wire has a diameter of {eq}D=0.95 cm {/eq} and is {eq}L=85 m {/eq} long. When connected to a {eq}V=21 V {/eq} source the wire passes a {eq}I=75 A {/eq} current. What is the resistivity of the wire?

Resistivity And Resistance:

The resistance of a wire is determined by the dimensions of the wire and the resistivity of the material, {eq}\rho {/eq}. The resistance is

{eq}\displaystyle R = \rho \frac{L}{A}, {/eq}

where L is the length of the wire and A is its cross-sectional area.

The current, I, through a resistance can be found using Ohm's law:

{eq}\displaystyle I = \frac{V}{R}, {/eq}

where V is the potential difference applied across the resistance.

Answer and Explanation: 1

Become a Study.com member to unlock this answer! Create your account

View this answer

The total resistance, R, of the wire can be found using Ohm's law:

{eq}\displaystyle R = \frac{V}{I}, {/eq}

where V = 21 V is the potential...

See full answer below.


Learn more about this topic:

Loading...
Electrical Resistance: Definition, Unit & Variables

from

Chapter 6 / Lesson 8
23K

What is electrical resistance? Learn the meaning and formula of electrical resistance with examples. Understand the factors on which the resistance depends.


Related to this Question

Explore our homework questions and answers library