CH19-HW01-FALL2010

CH19-HW01-FALL2010 - 1 CH19-HW01-FALL2010 Rachel Pereira...

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12/14/11 CH19-HW01-FALL2010 1/4 www.webassign.net/web/Student/Assignment-Responses/last?dep=3173277 Current Score : 15 / 15 Due : Sunday, October 30 2011 11:59 PM EDT 1. 1/1 points | Previous Answers MI3 18.1.X.001 If 1.5 10 16 electrons enter a light bulb in 3 milliseconds, what is the magnitude of the electron current at that point in the circuit? 5e18 5.00e+18 electrons/second Read the eBook Section 18.1 2. 1/1 points | Previous Answers MI3 18.1.X.002 If the electron current at a particular location in a circuit is 8 10 18 electrons/s, how many electrons pass that point in 6 minutes? 2.88e21 2.88e+21 electrons Read the eBook Section 18.1 3. 2/2 points | Previous Answers MI3 18.5.X.008 The density of mobile electrons in copper metal is 8.4 10 28 m -3 . Suppose that i = 7.0 10 18 electrons/s are drifting through a copper wire. (This is a typical value for a simple circuit.) The diameter of the wire is 0.5 mm. In this case, about how many minutes would it take for a single electron in the electron sea to drift from one end to the other end of a wire 29 cm long? 11.38 11.4 minutes (A puzzle: if the drift speed is so slow, how can a lamp light up as soon as you turn it on? We'll come back to this in the next chapter.) Read the eBook Section 18.5 4. 2/2 points | Previous Answers MI3 19.2.X.029

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