# Ch19 HW1 - Ch19 HW1 F2010 9:18 PM Stefan Coreth PY 208...

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12/17/10 9:18 PM Ch19 HW1 F2010 Page 1 of 3 http://www.webassign.net/[email protected]/[email protected] Current Score : 13 / 15 Due : Monday, October 4, 2010 11:25 AM EDT 1. 1/1 points Question: MI3 18.1.X.001 If 1.5 10 16 electrons enter a light bulb in 5 milliseconds, what is the magnitude of the electron current at that point in the circuit? 3e18 3.00e+18 electrons/second 2. 1/1 points Question: MI3 18.1.X.002 If the electron current at a particular location in a circuit is 10 10 18 electrons/s, how many electrons pass that point in 10 minutes? 6e21 6.00e+21 electrons 3. 0/2 points Question: MI3 18.5.X.008 The density of mobile electrons in copper metal is 8.4 10 28 m -3 . Suppose that i = 7.8 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 1.6 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 35 cm long? 5.774e-42 126 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.) 4. 2/2 points Question: MI3 19.2.X.029

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