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Page 303

| Figure 15-10 Typical charge and discharge curves: (A) For lead storage cell, and (B) for alkali storage cell. |

| manently connected through the rectifier to the ac source. Practically, they are always fully charged to ensure reliable operation of the equipment and devices that they supply. |

| Rectifiers |

| Where alternating-current sources exist, direct current can be provided through rectifiers (Figs. 15-11A and 15-11B). Among a variety of types, the copper-oxide rectifier appears to be the most used for battery recharging (Fig. 15-11C). A property of copper oxide prevents current from flowing in one direction but not in the other. Connections for an arrangement of rectifiers that gives an essentially constant dc voltage are shown in Fig 15-11D. The voltage applied is approximately 2.15 V per cell. |

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