123 Review and Assessment SUMMARY ■ Electricity can be produced by chemical action. ■ Cells are the basic unit for producing electricity by chemical action. Batteries are two or more cells connected together. ■ Primary cells cannot be recharged, while secondary cells can be recharged. ■ Some common primary cells include zinc-carbon, alkaline, mercury, lithium, and silver-oxide cells. ■ Nickel-cadmium, lead-acid, NiMH, and Li-ion cells are secondary cells. KNOW AND UNDERSTAND Answer the following questions using information in this chapter. 1. _____ is a source of electricity or electromotive force. A. Friction B. Chemical action C. Heat D. All of the above. 2. True or False? When mixing acid and water, always pour water into acid. 3. True or False? A voltaic cell converts electrical energy into chemical energy. 4. A cell that cannot be recharged is a _____. A. one-way cell B. secondary cell C. primary cell D. All of the above. 5. True or False? Polarization increases the output and terminal voltage of a cell. 6. True or False? In a dry cell, the electrolyte is in a paste form as opposed to a liquid form. 7. A cell that can be recharged is a _____. A. one-way cell B. secondary cell C. primary cell D. All of the above. ■ Connecting cells in series (– to +) increases their voltage rating, while connecting them in parallel (– to – and + to +) increases their current rating. ■ Battery capacity is a current producing rating measured in ampere-hours (Ah). ■ A photovoltaic cell produces electricity from light. ■ Photoresistive cells are light-sensitive resistors. ■ Th e thermocouple is a device used to produce electricity by heat. ■ Electricity can be produced by applying pressure to certain objects, such as quartz, tourmaline, and Rochelle salts. 8. Specifi c gravity _____. A. can be measured with a hydrometer B. can be used to determine the state of charge C. is the weight of a liquid as it compares to water D. All of the above. 9. _____ is a physical type of lead-acid battery. A. Flooded B. Gel C. Absorbent glass mat (AGM) D. All of the above. 10. True or False? In a series connection, the positive terminal of one cell is connected to the negative terminal of the second cell. 11. In a _____ connection, all positive terminals are connected and all negative terminals are connected. A. series B. parallel C. series-parallel D. None of the above. 12. What is the unit of measurement of battery capacity? A. Ampere-hour. B. Watt-hour. C. Kilohm. D. Coulomb. Copyright Goodheart-Willcox Co., Inc.