Deep Dive: T6A11
The correct answer is B: Carbon-zinc. Carbon-zinc batteries are not rechargeable - they are primary (non-rechargeable) batteries. Once discharged, they cannot be recharged and must be discarded. Carbon-zinc batteries are primary batteries that use a zinc anode and carbon cathode with an electrolyte. They're inexpensive and commonly used in low-drain applications, but they're not designed to be recharged. Attempting to recharge them can be dangerous. In contrast, Nickel-cadmium, Lead-acid, and Lithium-ion are all secondary (rechargeable) batteries designed to be recharged many times. Understanding which batteries are rechargeable is important for proper battery selection and safety.
Why Other Answers Are Wrong
Option A: Incorrect. Nickel-cadmium (NiCd) batteries are rechargeable. They're secondary batteries designed to be recharged many times. Option C: Incorrect. Lead-acid batteries are rechargeable. They're commonly used in vehicles and base stations and are designed to be recharged. Option D: Incorrect. Lithium-ion batteries are rechargeable. They're used in modern portable devices and are designed to be recharged many times.
Exam Tip
Carbon-zinc = Not rechargeable. Remember: Carbon-zinc batteries are primary (non-rechargeable) batteries - once discharged, they cannot be recharged.
Memory Aid
**C**arbon-**z**inc = **N**ot **R**echargeable (think 'CZ = NR')
Real-World Example
You're using carbon-zinc batteries in a low-power device. When they're discharged, you must replace them - they cannot be recharged. If you tried to recharge them, it could be dangerous. This is why carbon-zinc batteries are considered disposable primary batteries.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T6A
Reference: 2022-2026 Question Pool · T6 - Electrical components
Key Concepts
Verified Content
Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T6A topic.