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13. A resistor is specified as having a value of 68 , but is measured with an ohmmeter as 63 . The value is off by which of the following percentages (a) 7.4% (b) 7.9% (c) 5% (d) 10% 14. Suppose a resistor is rated at 3.3 k between (a) 2970 and 3630 . (b) 3295 and 3305 . (c) 3135 and 3465 . (d) 2.8 k and 3.8 k . 15. A package of resistors is rated at 56 the following values indicates a reject (a) 50.0 (b) 53.0 (c) 59.7 (d) 61.1 5%. This means it can be expected to have a value
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10%. You test them with an ohmmeter. Which of
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16. A resistor has a value of 680 , and you expect that it will have to draw 1 mA maximum continuous current in a circuit you re building. What power rating is good for this application, but not needlessly high (a) 1 4 W (c) 1 2 W (c) 1 W (d) 2 W 17. Suppose a 1-k resistor will dissipate 1.05 W, and you have a good supply of 1-W resistors of various ohmic values. If there s room for 20 percent resistance error, the cheapest solution is to use (a) four 1-k , 1-W resistors in series-parallel. (b) a pair of 2.2-k , 1-W resistors in parallel. (c) a set of three 3.3-k , 1-W resistors in parallel. (d) a single 1-k , 1-W resistor, because all manufacturers allow for a 10 percent margin of safety when rating resistors for their power-handling capability. 18. Suppose a carbon-composition resistor has the following colored bands on it: red, red, red, gold. This indicates a resistance of (a) 22 . (b) 220 . (c) 2.2 k . (d) 22 k .
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19. The actual resistance of the component described in the previous question can be expected to vary above or below the specified ohmic value by up to what amount (a) 11 (b) 110 (c) 22 (d) 220 20. Suppose a carbon-composition resistor has the following colored bands on it: gray, red, yellow. This unit can be expected to have a value within approximately what range (a) 660 k to 980 k (b) 740 k to 900 k (c) 7.4 k to 9.0 k (d) The manufacturer does not make any claim.
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CHAPTER
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Cells and Batteries
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IN ELECTRICITY AND ELECTRONICS, A CELL IS A UNIT SOURCE OF DC ENERGY. WHEN TWO OR MORE
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cells are connected in series, the result is known as a battery. There are many types of cells and batteries, and new types are constantly being invented.
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Electrochemical Energy
Early in the history of electrical science, laboratory physicists found that when metals came into contact with certain chemical solutions, voltages appeared between the pieces of metal. These were the first electrochemical cells. A piece of lead and a piece of lead dioxide immersed in an acid solution (Fig. 7-1) acquire a persistent potential difference. This can be detected by connecting a galvanometer between the pieces of metal. A resistor of about 1000 must be used in series with the galvanometer in experiments of this kind, because connecting the galvanometer directly will cause too much current to flow, possibly damaging the galvanometer and causing the acid to boil. The chemicals and the metal have an inherent ability to produce a constant exchange of charge carriers. If the galvanometer and resistor are left hooked up between the two pieces of metal for a long time, the current will gradually decrease, and the electrodes will become coated. All the chemical energy in the acid will have been turned into electrical energy as current in the wire and galvanometer. In turn, this current will have heated the resistor (another form of kinetic energy), and escaped into the air and into space.
Primary and Secondary Cells Some electrical cells, once their chemical energy has all been changed to electricity and used up, must be thrown away. These are called primary cells. Other kinds of cells, such as the lead-and-acid type, can get their chemical energy back again by means of recharging. Such a cell is a secondary cell. Primary cells include the ones you usually put in a flashlight, in a transistor radio, and in various other consumer devices. They use dry electrolyte pastes along with metal electrodes. They go by names such as dry cell, zinc-carbon cell, or alkaline cell. Go into a department store and find a rack of batteries, and you ll see various sizes and types of primary cells, such as AAA batteries, D batteries,
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