Deep Dive: G6A06
The correct answer is B: The resistor's inductance could make circuit performance unpredictable. Why wire-wound resistors should not be used in RF circuits is that the resistor's inductance could make circuit performance unpredictable. Wire-wound resistors have significant inductance that affects RF operation. For amateur radio operators, this is important for RF circuit design. Understanding this helps when selecting resistors.
Why Other Answers Are Wrong
Option A: Incorrect. Tolerance isn't the issue - wire-wound resistors can have good tolerance. The issue is inductance, not tolerance. Option C: Incorrect. Overheating isn't the specific issue - wire-wound resistors can handle power. The issue is inductance affecting RF performance. Option D: Incorrect. Internal capacitance isn't the issue - the issue is inductance. Wire-wound resistors have inductance, not problematic capacitance.
Exam Tip
Don't use wire-wound in RF = inductance makes performance unpredictable. Think 'W'ire-'W'ound = 'W'inding creates 'I'nductance. Wire-wound resistors have significant inductance that affects RF operation. Not tolerance, not overheating, not capacitance - just inductance.
Memory Aid
Don't use wire-wound in RF = inductance makes performance unpredictable. Think 'W'ire-'W'ound = 'W'inding creates 'I'nductance. Wire-wound resistors have significant inductance that affects RF operation. Use carbon or metal film for RF.
Real-World Example
You design an RF circuit. Wire-wound resistors have significant inductance from their coil construction, which can resonate with circuit capacitance or affect impedance at RF frequencies. This makes circuit performance unpredictable. Use carbon or metal film resistors for RF instead.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G6A
Reference: 2023-2027 Question Pool · G6 - Circuit Components
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G6A topic.