The small "button" cells used in hearing aids and hand calculators are being replaced by ________ cells.
A)Ni-Cad
B)hydrogen
C)zinc-air
D)copper-acid

Question

Quizplus · Accepted Answer

Zinc-air cells are commonly used in small button cell applications like hearing aids and hand calculators due to their high energy density and long life. They work by using oxygen from the air to react with zinc in the cell, producing electricity. Ni-Cad cells are not commonly used anymore due to their undesirable environmental impact and memory effect. Hydrogen cells are typically used in larger applications like vehicles, and copper-acid cells are not commonly used in small electronics applications.

The Small "Button" Cells Used in Hearing Aids and Hand