lecture11 - b Physics 2102 a Jonathan Dowling Physics 2102...

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Physics 2102 Physics 2102 Lecture 11 Lecture 11 DC Circuits DC Circuits Physics 2102 Jonathan Dowling b a
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Incandescent light bulbs Incandescent light bulbs (a) Which light bulb has a smaller resistance: a 60W, or a 100W one? (b) Is the resistance of a light bulb different when it is on and off? (c) Which light bulb has a larger current through its filament: a 60W one, or a 100 W one? (d) Would a light bulb be any brighter if used in Europe, using 240 V outlets? (e) Would a US light bulb used in Europe last more or less time? (f) Why do light bulbs mostly burn out when switched on?
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b a The battery operates as a “pump” that moves positive charges from lower to higher electric potential. A battery is an example of an “electromotive force” (EMF) device. These come in various kinds, and all transform one source of energy into electrical energy. A battery uses chemical energy, a generator mechanical energy, a solar cell energy from light, etc. The difference in potential energy that the device establishes is called the EMF and denoted by P . EMF devices and single loop circuits EMF devices and single loop circuits h = iR a b c d=a V a P iR b a d c - + i i
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Given the emf devices and resistors in a circuit, we want to calculate the circulating currents. Circuit solving consists in “taking a walk” along
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This note was uploaded on 11/18/2011 for the course PHYSICS 2102 taught by Professor Dowling during the Fall '10 term at LSU.

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lecture11 - b Physics 2102 a Jonathan Dowling Physics 2102...

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