116 Electricity & Electronics SECTION 7.1 REVIEW Answer the following questions using information in this section. 1. A simple voltaic cell contains which of the following? A. Cathode. B. Anode. C. Electrolyte. D. All of the above. 2. Which of the following is a type of primary cell? A. Lead-acid cell. B. Nickel-cadmium cell. C. Silver-oxide cell. D. All of the above. 3. True or False? A primary cell is a cell in which the chemical action cannot be reversed. 4. Which of the following is an advantage of a silver-oxide cell? A. Stable discharge voltage. B. Low density per unit volume. C. Large size. D. All of the above. (Continued) Primary and Secondary Batteries Category Type Confi guration Nominal Voltage Number of Rechargings Typical Applications Positive-Acting Substance Electrolyte Negative-Acting Substance Primary Carbon-Zinc Battery MnO2 ZnCl2 NH4Cl Zn 1.5 V 0 Lighting equipment, radios, calculators, hearing aids, toys. Alkaline- Manganese Dioxide Battery MnO2 KOH(ZnO) Zn 1.5 V 0 Electric shavers, digital cameras, calculators, toys. Mercury Battery HgO KOH(ZnO) Zn 1.35 V 0 Hearing aids, watches, calculators. Silver-Oxide Battery Ag2O KOH(ZnO) Zn 1.55 V 0 Laptops, hearing aids, battery reserve for spacecraft. Lithium Battery (CF)n Organic tetrachloride solvent Li 3.0 V 0 Medical devices, water and gas meters, laptops. MnO2 Organic tetrachloride solvent Li 3.0 V 0 Memory backup, digital cameras, watches, toys. Secondary Nickel-Cadmium Battery NiOOH KOH Cd 1.2 V 300–1,000 Lighting equipment, electric tools, guide lights. Lead-Acid Battery PbO2 H2SO4 Pb 2.0 V 100–300 Cars, backup power supplies, emergency lighting. Nickel-Metal Battery NiMH KOH Cd 1.2 V 500 Hybrid vehicles, digital cameras, fl ashlights, personal electronics. Lithium-Ion Battery C LiPF6 LiCoO2 3.6 V 500–1,000 Smartphones, laptops, power tools, electric cars. Goodheart-Willcox Publisher Figure 7-15. A comparison of primary and secondary batteries and their uses. Note that there are many different confi gurations of each battery listed here are just examples of common confi gurations. Copyright Goodheart-Willcox Co., Inc.