Electrical Engineering ⇒ Topic : Small nickel-cadmium cells
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Maninder
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Small nickel-cadmium cells. The obvious advantages of nickel cadmium cells prompted the scientists to develop them in small sizes. Today small-sized nickel-cadmium cells are *used in cordless electric appliances such as electric shavers, hearing aids, photography equipment and in space exploration. A popular size is the 1.2 V, 4 Ah battery which has a 1-hour discharge rate. The ingredients of the small nickel-cadmium cell are the same as for the larger type. The plates are formed of a woven nickel screen and a paste consisting of the active materials is pressed into the spaces within the screen. A separator is placed between the positive and negative plates and the whole rolled to form a cylinder which is sealed into a small can for protection. The metal can forms the negative terminal of the cell and an insulated metal button at the top is the positive terminal. The main disadvantage of a nickel-cadmium cell, compared to carbon-zinc primary cell (i.e. dry cell), is its relatively higher initial cost. Since nickel-cadmium cell is rechargeable, it offers a lower total cost because it does not have to be discarded after it has been exhausted. | |
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