You are an electrical engineer investigating different button batteries for possible use in a design. You obtain the discharge curves shown in the graph for four different batteries under the same conditions and discharge load.

(a) Write a paragraph in which you interpret curve (a) and curve (d) to a customer seeking a battery for an electronic device.

(b) Both (b) and (d) represent zinc-air cells. Explain why there is a difference in these two curves. ( Which electrode in a zinc-air cell has an unlimited life? Compare the approximate area of the other electrode for the two cells.)

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Cell potential, volts 1.5- 1.0- 0.5 0. 0 40 80 120 Discharge time, hours 160 d 200