A copper wire 100m long with cross-sectional area of 2x10 -4 cm 2 is heated from room temperature of 25 C to 200 C. Find a) The initial resistance of wire b) The increase in resistance from 25 to 200 Celsius

A copper wire 100m long with cross-sectional area of 2x10 -4 cm 2 is heated from room temperature of 25 C to 200 C. Find a) The initial resistance of wire b) The increase in resistance from 25 to 200 Celsius

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 61P

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Ohm's law

Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.

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In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.

Question

A copper wire 100m long with cross-sectional area of 2x10 -4 cm 2 is
heated from room temperature of 25 C to 200 C. Find
a) The initial resistance of wire
b) The increase in resistance from 25 to 200 Celsius

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