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Chapter 24: Problem 4

Good conductors of electricity are often good conductors of heat. Why might this be?

Short Answer

Expert verified
Good conductors of electricity are usually also good conductors of heat because both processes rely on the same mechanism, the movement and collision of free electrons. This movement enables the transfer of energy, be it electrical or thermal.

Step by step solution

01

Understanding Conduction

Conduction is the process through which energy is transferred in materials. It occurs when particles within the material are excited by external factors and this excitement is transferred from one particle to another.
02

Understanding the Nature of Good Conductors

Good conductors are materials that allow the easy flow of electricity or thermal energy. They have a large number of free electrons that allow movement of energy. These free electrons move and collide with other nearby atoms, which then triggers their excitement and energy transfer.
03

Relating Electricity and Heat Conduction

The good conductors of electricity are usually also good conductors of heat because both processes rely on the movement of free electrons in the material. As these electrons move, they collide with other atoms, creating excitement, and energy (thermal or electrical) is transferred.

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Most popular questions from this chapter

A \(50-\mathrm{W}\) and a \(100-\mathrm{W}\) light bulb are both designed to operate at \(120 \mathrm{V}\). Which has the lower resistance?

A \(35-\Omega\) electric stove burner consumes \(1.5 \mathrm{kW}\) of power. At what voltage does it operate?

An incandescent lightbulb draws \(0.50 \mathrm{A},\) while a compact fluorescent with the same light output draws 125 mA. Both operate on standard \(120-\mathrm{V}\) household power. How do their energy-consumption rates compare?

The resistance of a metal increases with increasing temperature, while the resistance of a semiconductor decreases. Why the difference?

You're heading out for spring break, but your car won't start. Your friend says you might have corrosion at the battery terminals- -a frequent cause of hard starting because of increased resistance. Having read Example \(24.4,\) you know that the resistance between battery and starter should be around \(1 \mathrm{m} \Omega\). While your friend cranks the starter, you measure \(4.2 \mathrm{V}\) between the battery terminal and the wire carrying current to the starter motor. If the motor draws \(125 \mathrm{A},\) is the resistance in its normal range?
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