***Each answer has 3 sig figs. Accuracy is important -- do not round intermediat
ID: 2270510 • Letter: #
Question
***Each answer has 3 sig figs. Accuracy is important -- do not round intermediates!***
4. If a current of 71.7mA exists in a metal wire, how many electrons flow past a given cross section of the wire in 10.0min?
5. We connect a 3990-Ohm resistor across a 12.0-V battery. (a) Find the current flowing through a resistor. (b) Find the amount of power dissipated by the resistor. (c) Find the amount of energy dissipated by the resistor in 1.00h.
Correct answers will be in these ranges:
4: 2.20x10^20-3.40x10^20
5(a): 2.00-7.00mA
5(b): 20.0-80.0mW
5(c): 100-300J
Explanation / Answer
4.q=it
=71.7*10^-3 *10*60
=43.02 c
(1.6*10^-19)n=43.02
n=2.688*10^20 electrons
5. i=v/r
=12/3990
=3.007mA
(b)i^2 * r
=36mW
c) i^2*r*t
=36mW*60*60
129.92 J
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