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Unformatted text preview: the resistivity of copper is = 1 . 69 108 m Since we also know the length (from the plot) and the cross sectional area of the wire we can calculate the resistance. R = L A = x s r 2 Hence, from Ohms law the current in the wire is i = V R = V s x s r 2 = V s r 2 x s = 3 . 103 A 8 Chapter 27: Circuits The last two chapters have, in essence, been a build up to this chapter. We have spent these last two chapters learning about three key concepts: capacitors, resistors, and energy in electric circuits. In this chapter we will bring these three ideas together and use them to talk about electric circuits as a whole. We will begin to see why electric circuits are useful and why they have become the cornerstone of the modern world. 28...
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 Spring '08
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 Physics, Energy, Power

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