Lesson_3.3_Homework

# Lesson_3.3_Homework - Lesson 3.3 Homework 1. A 0.9-V...

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Lesson 3.3 Homework 1. A 0.9-V potential difference is maintained across a 1.5 m length of tungsten wire that has a cross-sectional area of 0.6 mm 2 . What is the current in the wire? 2. A metal wire of resistance R is stretched to 1.5 times its original length. What is the resistance of the stretched wire? 3. An aluminum rod has a resistance of 1.234 at 20 o C. What will be the resistance of this rod at 120 o C? 4. A coil of Nichrome wire is 25 m long. The wire has a diameter of 4.0 mm and is at 20 o C. If it carries current of 5.0 A, find (a) the resistance of the wire (b) the voltage across it (c) the magnitude of the electric field in the wire (d) the power delivered to the wire (e) If the temperature is increased to 340 o C and the voltage remains the same, what is the power delivered? 5. Compute the cost per day of operating a lamp that draws 1.7 A from a 110-V supply if electricity costs 8 cents a unit. 6.

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## This note was uploaded on 05/01/2011 for the course PHY 2049 taught by Professor George during the Spring '11 term at Edison State College.

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Lesson_3.3_Homework - Lesson 3.3 Homework 1. A 0.9-V...

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