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Worksheet #4

# Worksheet #4 - (a Find the power the toaster consumes when...

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Physics 202 SI Sessions Worksheet #4 -Problem 1 The Alaska oil pipeline is approximately 1.27x10 3 km long, 120 cm in diameter, and made of steel with a thickness of about 1.0 cm. Steel has a resistivity of 1.80x10 -7 m. What is the total resistance of the pipeline over its entire length? Problem 2 A cylindrical wire having resistance 4Ω is stretched to twice its initial length. What is its resistance? Problem 3 A certain toaster has a heating element made of Nichrome resistance wire. When the toaster is first connected to a 120 V source (and the wire is at a temperature of 20.0 ˚C), the initial current is 1.80 A. However, the current begins to decease as the resistive element warms up. When the toaster has reached its final operating temperature, the current has dropped to 1.53 A.

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Unformatted text preview: (a) Find the power the toaster consumes when it is at its operating temperature. (b) What is the final temperature of the heating element? Problem 4 What is the fractional change in the resistance of an iron filament when its temperature changes from 25.0˚ to 50.0˚ C? Physics 202 SI Sessions Worksheet #4 Problem 5 Consider the circuit shown below. (a) What is the potential difference across the 15 Ω resistor? (b) What is the power absorbed by the 15 Ω resistor? (c) What is the current through the 10 Ω resistor? (d) What is the power delivered by the battery? (e) What power is absorbed by each of the 10 Ω resistors? 15.0 ohm 10. 0 ohm 10. 0 ohm 30.0 V...
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Worksheet #4 - (a Find the power the toaster consumes when...

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