A wire is 100.0 m long and 0.800 mm in diameter. The first x meters of the wire is made of copper and the rest of the wire is made of tungsten. When a 10.0 V potential difference is applied across the ends of the wire in a 20.0°C environment, a current of 1.16 A is observed. a) How much of the wire is made of copper? x = ______________________________ b) If the apparatus is moved to a 0.0°C environment, would you expect the current to increase, decrease, or remain constant? Explain your answer, including a description of what is going on inside the wire at a microscopic level.
A wire is 100.0 m long and 0.800 mm in diameter. The first x meters of the wire is made of copper and the rest of the wire is made of tungsten. When a 10.0 V potential difference is applied across the ends of the wire in a 20.0°C environment, a current of 1.16 A is observed.
a) How much of the wire is made of copper? x = ______________________________
b) If the apparatus is moved to a 0.0°C environment, would you expect the current to increase, decrease, or remain constant? Explain your answer, including a description of what is going on inside the wire at a microscopic level.
c) If the apparatus is moved to a 125°C environment, how much power will be dissipated by the wire? Explain what that means (what forms of energy are involved, what is the rate of energy transformation)
P = ______________________________
Given:
The length of the wire is 100 m.
The diameter of the wire is 0.800 mm.
The potential difference applied across the ends is 10.0 V.
The current across the wire is 1.16 A.
Introduction:
Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance reduces the ease with which electrons are able to move within the structure of the material.
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