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case filled with books can power a subcompact electric car. Smaller cells, called micro fuel cells, can provide dc to run devices that have historically operated from conventional cells and batteries. These include portable radios, lanterns, and notebook computers.
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Other Fuels Hydrogen is not the only chemical that can be used to make a fuel cell. Almost anything that will combine with oxygen to form energy has been considered. Methanol, a form of alcohol, has the advantage of being easier to transport and store than hydrogen, because it exists as a liquid at room temperature. Propane is another chemical that has been used for powering fuel cells. This is the substance that is stored in liquid form in tanks for barbecue grills and some rural home heating systems. Methane, also known as natural gas, has been used as well. Some scientists and engineers object to the use of these fuels because they, especially propane and methane, closely resemble fuels that are already commonplace, and on which society has developed the sort of dependence that purists would like to get away from. In addition, they are derived from so-called fossil fuel sources, the supplies of which, however great they might be today, are nevertheless finite. A Promising Technology As of this writing (2006), fuel cells have not yet replaced conventional electrochemical cells and batteries. Cost is the main reason. Hydrogen is the most abundant and simplest chemical element in the universe, and it does not produce any toxic by-products. This would at first seem to make it the ideal choice for use in fuel cells. But storage and transport of hydrogen has proven to be difficult and expensive. This is especially true for fuel cells and stacks intended for systems that aren t fixed to permanent pipelines. An interesting scenario, suggested by one of my physics teachers all the way back in the 1970s, is the piping of hydrogen gas through the lines designed to carry methane. Some modification of existing lines would be required in order to safely handle hydrogen, which escapes through small cracks and openings more easily than methane. But hydrogen, if obtained at reasonable cost and in abundance, could be used to power large fuel-cell stacks in common households and businesses. The dc from such a stack could be converted to utility ac by power inverters similar to those used with PV energy systems. The entire home power system would be about the size of a gas furnace.
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Refer to the text in this chapter if necessary. A good score is 18 correct. Answers are in the back of the book. 1. The chemical energy in a battery or cell (a) is a form of kinetic energy. (b) cannot be replenished once it is gone. (c) changes to electrical energy when the cell is used. (d) is caused by electric current.
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2. A cell that cannot be recharged is known as (a) a dry cell. (b) a wet cell. (c) a primary cell. (d) secondary cell. 3. A Weston cell is generally used (a) as a current reference source. (b) as a voltage reference source. (c) as a power reference source. (d) as a fuel cell. 4. The voltage produced by a battery of multiple cells connected in series is (a) less than the voltage produced by a cell of the same composition. (b) the same as the voltage produced by a cell of the same composition. (c) more than the voltage produced by a cell of the same composition. (d) always a whole-number multiple of 1.018 V. 5. A direct short-circuit of a large battery can cause (a) an increase in its voltage. (b) no harm other than a rapid discharge of its energy. (c) the current to drop to zero. (d) a physical rupture or explosion. 6. Suppose a cell of 1.5 V delivers 100 mA for 7 hours and 20 minutes, and then it is replaced. How much energy is supplied during this time (a) 0.49 Wh (b) 1.1 Wh (c) 7.33 Wh (d) 733 mWh 7. Suppose a 12-V automotive battery is rated at 36 Ah. If a 100-W, 12-V bulb is connected across this battery, approximately how long will the bulb stay aglow, assuming the battery has been fully charged (a) 4 hours and 20 minutes (b) 432 hours (c) 3.6 hours (d) 21.6 minutes 8. Alkaline cells (a) are cheaper than zinc-carbon cells. (b) generally work better in radios than zinc-carbon cells. (c) have higher voltages than zinc-carbon cells. (d) have shorter shelf lives than zinc-carbon cells.
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