Deep Dive: T5C02
The correct answer is A: The farad. The unit of capacitance is the farad (abbreviated as 'F'), named after Michael Faraday. One farad is a very large unit - most capacitors are measured in microfarads (μF), nanofarads (nF), or picofarads (pF). Capacitance measures how much charge a capacitor can store per volt. One farad means the capacitor can store one coulomb of charge when one volt is applied. In practice, you'll rarely see capacitors rated in farads - they're typically in microfarads (millionths of a farad), nanofarads (billionths), or picofarads (trillionths). Understanding the farad as the base unit helps with unit conversions.
Why Other Answers Are Wrong
Option B: Incorrect. The ohm is the unit of resistance, not capacitance. Resistance and capacitance are different properties. Option C: Incorrect. The volt is the unit of voltage, not capacitance. Voltage and capacitance are different quantities. Option D: Incorrect. The henry is the unit of inductance, not capacitance. Inductance and capacitance are different properties.
Exam Tip
Capacitance unit = Farad. Remember: The unit of capacitance is the farad (F). Most capacitors are measured in microfarads (μF), nanofarads (nF), or picofarads (pF).
Memory Aid
**C**apacitance = **F**arad (think 'C = F' = Capacitance = Farad)
Real-World Example
A capacitor in your RF circuit might be rated at 0.001 microfarads (1 nanofarad or 1000 picofarads). All of these are ways of expressing the same capacitance value, with the farad as the base unit. Understanding that the farad is the unit of capacitance helps you understand capacitor specifications.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T5C
Reference: FCC Part 97.3
Key Concepts
Verified Content
Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T5C topic.