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9. The energy in a cell or battery depends mainly on (a) its physical size. (b) the current drawn from it. (c) its voltage. (d) all of the above. 10. In which of the following devices would a lantern battery most likely be found (a) A heart pacemaker (b) An electronic calculator (c) An LCD wall clock (d) A two-way portable radio 11. In which of the following devices would a transistor battery be the best power choice (a) A heart pacemaker (b) An electronic calculator (c) An LCD wall clock (d) A two-way portable radio 12. For which of the following applications would you choose a lithium battery (a) A microcomputer memory backup (b) A two-way portable radio (c) A stand-alone solar-electric system (d) A rechargeable lantern 13. Where would you most likely find a lead-acid battery (a) In a portable audio CD player (b) In an uninterruptible power supply (c) In an LCD wall clock (d) In a flashlight 14. A cell or battery that maintains a constant current-delivering capability almost until it dies is said to have (a) a large ampere-hour rating. (b) excellent energy capacity. (c) a flat discharge curve. (d) good energy storage capacity per unit volume. 15. Where might you find a nickel-based battery (a) In a satellite (b) In a portable cassette player (c) In a handheld radio transceiver (d) More than one of the above

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The construction of a photovoltaic cell is shown in Fig. 7-7. The device is a flat semiconductor P-N junction, and the assembly is made transparent so that light can fall directly on the P-type silicon. The metal ribbing, forming the positive electrode, is interconnected by means of tiny wires. The negative electrode is a metal backing, placed in contact with the N-type silicon. Most solar cells provide about 0.5 V. If there is very low current demand, dim light will result in the full output voltage from a solar cell. As the current demand increases, brighter light is needed to produce the full output voltage. There is a maximum limit to the current that can be provided from a solar cell, no matter how bright the light. This limit is increased by connecting solar cells in parallel.

16. A disadvantage of mercury cells and batteries is the fact that (a) they don t last as long as other types. (b) they have a flat discharge curve. (c) mercury is destructive to the environment. (d) they need to be recharged often. 17. Which kind of battery should never be used until it dies (a) Silver-oxide (b) Lead-acid (c) Nickel-based (d) Mercury 18. The useful current that is delivered by a solar panel can be increased by (a) connecting capacitors in parallel with the solar cells. (b) connecting resistors in series with the solar cells. (c) connecting two or more groups of solar cells in parallel. (d) connecting resistors in parallel with the solar cells. 19. An interactive solar power system (a) allows a homeowner to sell power to the electric company. (b) lets the batteries recharge at night. (c) powers lights, but not electronic devices. (d) is totally independent from the electric company. 20. An advantage of methanol over hydrogen for use in fuel cells is the fact that (a) methanol is the most abundant element in the universe. (b) methanol is not flammable. (c) methanol is a solid at room temperature. (d) methanol is easier to transport and store.

Solar cells have become cheaper and more efficient in recent years, as researchers have looked to them as a long-term alternative energy source. Solar panels are used in satellites. They can be used in conjunction with rechargeable batteries, such as the lead-acid or nickel-cadmium types, to provide power independent of the commercial utilities. A completely independent solar/battery power system is called a stand-alone system. It generally uses large solar panels, large-capacity lead-acid or NICAD batteries, power converters to convert the dc into ac, and a rather sophisticated charging circuit. These systems are best suited to environments where there is sunshine a high percentage of the time. Solar cells, either alone or supplemented with rechargeable batteries, can be connected into a home electric system in an interactive arrangement with the electric utilities. When the solar power system can t provide for the needs of the household all by itself, the utility company can take up the slack. Conversely, when the solar power system supplies more than enough for the needs of the home, the utility company can buy the excess.

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The earth has a core made up largely of iron, heated to the extent that some of it is liquid. As the earth rotates, the iron flows in complex ways. It is thought that this flow is responsible for the magnetic field that surrounds the earth. Some other planets, notably Jupiter, have magnetic fields as well. Even the sun has one.

You might get the idea that you can connect hundreds, or even thousands, of cells in series and obtain batteries with fantastically high EMFs. Why not put 1,000 zinc-carbon cells in series, for example, and get 1.5 kV Or put 2,500 solar cells in series and get 1.25 kV Maybe it s possible to put a billion solar cells in series, out in some vast sun-scorched desert wasteland, and use the resulting 500 MV (megavolts) to feed the greatest high-tension power line the world has ever seen.

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