ITPEC FE Morning October 2020 Question 21
ITPEC FE Morning October 2020 — Question 21 of 80
Secondary (Rechargeable) Battery — identify which battery type is rechargeable.
A secondary battery is one that can be recharged and reused. A primary battery is single-use (disposable).
- •Lithium-ion battery — rechargeable (secondary), used in smartphones, laptops, EVs
- •Alkaline-manganese dry-cell — disposable (primary), common AA/AAA batteries
- •Silver-oxide battery — disposable (primary), used in watches and small devices
- •Fuel cell — not a battery; continuously converts chemical energy (e.g. hydrogen + oxygen) into electricity
Why not others:
- (a) Alkaline-manganese — primary (non-rechargeable)
- (b) Fuel cell — not a battery at all; it's an energy conversion device
- (d) Silver-oxide — primary (non-rechargeable)
Key rule: "Secondary" = rechargeable. Lithium-ion is the most common rechargeable battery in modern devices.
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