Deep Dive: E5A09
The correct answer is C: Resistance divided by the reactance of either the inductance or capacitance. How is the Q of an RLC parallel resonant circuit calculated is resistance divided by the reactance of either the inductance or capacitance. Q = R/X for parallel circuits. For amateur radio operators, this is important for circuit calculations. Understanding this helps when calculating Q.
Why Other Answers Are Wrong
Option A: Incorrect. Reactance divided by resistance isn't correct - for parallel circuits, Q = R/X. Reactance/resistance is wrong. Option B: Incorrect. Reactance multiplied by resistance isn't correct - for parallel circuits, Q = R/X. Reactance×resistance is wrong. Option D: Incorrect. Reactance of inductance multiplied by reactance of capacitance isn't correct - for parallel circuits, Q = R/X. XL×XC is wrong.
Exam Tip
Parallel RLC Q = resistance divided by reactance of either L or C. Think 'P'arallel 'Q' = 'R'/'X'. Q = R/X for parallel circuits. Not X/R, not X×R, not XL×XC - just R/X.
Memory Aid
Parallel RLC Q = resistance divided by reactance of either L or C. Think 'P'arallel 'Q' = 'R'/'X'. Q = R/X for parallel circuits. Important for circuit calculations.
Real-World Example
The Q of an RLC parallel resonant circuit: It's calculated as resistance divided by the reactance of either the inductance or capacitance. Q = R/X, where X is XL or XC (they're equal at resonance). This is the calculation - R/X for parallel circuits.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E5A
Reference: 2024-2028 Question Pool · E5 - Electrical Principles
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E5A topic.