Problem Set 6

Problem Set 6 - MASSACHUSETTS INSTITUTE OF TECHNOLOGY...

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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.02 Fall 2007 Turn in to boxes at classroom entrance labeled with your name and group (e.g. L02 2A) Problem Set 6 Due: Wednesday, October 17 th at beginning of class (before 10:15/1:15) Warm Up Problem 1: Short Questions (a) If charges flow very slowly through a metal, why does it not require several hours for light to come on when you throw a switch? (b) What advantage does 120-V operation offer over 240 V? What are the disadvantages? (c) Why is it possible for a bird to stand on a high-voltage wire without getting electrocuted? (d) If your car’s headlights are on when you start the ignition, why do they dim while the car is starting? (e) Suppose a person falling from a building on the way down grabs a high-voltage wire. If the wire supports him as he hangs from it, will he be electrocuted? If the wire then breaks, should he continue to hold onto the end of the wire as he falls? (f) A series circuit consists of three identical lamps connected to a battery as shown in the figure below. When the switch S is closed, what happens to the brightness of the light bulbs? Explain your answer. PS06-1
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Analytic Problems… Problem 2: Battery Life AAA, AA, … D batteries have an open circuit voltage (EMF) of 1.5 V. The difference between different sizes is in their lifetime (total energy storage). A AAA battery has a life of about 0.5 A- hr while a D battery has a life of about 10 A-hr.
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Problem Set 6 - MASSACHUSETTS INSTITUTE OF TECHNOLOGY...

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