What are secondary cells?

What are secondary cells?

• A. Rechargeable batteries
• B. Primary cells
• C. Fuel cells
• D. Supercapacitors

Answer: (A)

Secondary cells are rechargeable batteries; they store chemical energy and can be charged again after discharging because applying electrical energy drives the chemical reactions in reverse, restoring the original materials. This reversibility is what allows many cycles of use. Examples include lead-acid, nickel-metal hydride, and lithium-ion batteries, which power devices from cars to smartphones. The other options don’t fit as well: a primary cell is designed for a one-time discharge and isn’t rechargeable; a fuel cell produces electricity from a continuous supply of fuel and oxidizer and isn’t stored energy in a fixed cell; a supercapacitor stores energy electrostatically and isn’t typically categorized as a rechargeable chemical battery in this context.

Secondary cells are rechargeable batteries; they store chemical energy and can be charged again after discharging because applying electrical energy drives the chemical reactions in reverse, restoring the original materials. This reversibility is what allows many cycles of use. Examples include lead-acid, nickel-metal hydride, and lithium-ion batteries, which power devices from cars to smartphones. The other options don’t fit as well: a primary cell is designed for a one-time discharge and isn’t rechargeable; a fuel cell produces electricity from a continuous supply of fuel and oxidizer and isn’t stored energy in a fixed cell; a supercapacitor stores energy electrostatically and isn’t typically categorized as a rechargeable chemical battery in this context.