Deep Dive: E6D02
The correct answer is A: Series RLC in parallel with a shunt C representing electrode and stray capacitance. What is the equivalent circuit of a quartz crystal is series RLC in parallel with a shunt C representing electrode and stray capacitance. Quartz crystals have series resonance and parallel capacitance. For amateur radio operators, this is important for oscillator knowledge. Understanding this helps when working with crystal oscillators.
Why Other Answers Are Wrong
Option B: Incorrect. Parallel RLC with C as parallel combination isn't correct - crystal is series RLC in parallel with shunt C. Parallel RLC isn't correct. Option C: Incorrect. Series RLC with C as parallel combination isn't correct - crystal is series RLC in parallel with shunt C. C as parallel combination isn't the structure. Option D: Incorrect. Parallel RLC with C as series combination isn't correct - crystal is series RLC in parallel with shunt C. Series combination isn't correct.
Exam Tip
Quartz crystal equivalent circuit = series RLC in parallel with shunt C (electrode/stray). Think 'Q'uartz 'C'rystal = 'S'eries 'R'LC 'P'arallel 'C'. Quartz crystals have series resonance and parallel capacitance. Not parallel RLC, not series with parallel C combination - just series RLC parallel shunt C.
Memory Aid
Quartz crystal equivalent circuit = series RLC in parallel with shunt C (electrode/stray). Think 'Q'uartz 'C'rystal = 'S'eries 'R'LC 'P'arallel 'C'. Quartz crystals have series resonance and parallel capacitance. Important for oscillator knowledge.
Real-World Example
The equivalent circuit of a quartz crystal: It's a series RLC in parallel with a shunt C representing electrode and stray capacitance. The series RLC represents the crystal's resonance, and the parallel C represents the electrode and stray capacitance. This is the equivalent circuit - series RLC parallel shunt C.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E6D
Reference: 2024-2028 Question Pool · E6 - Circuit Components
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E6D topic.