What electrical component is typically constructed as a coil of wire?
The correct answer is D: Inductor. An inductor is the electrical component typically constructed as a coil of wire. Inductors are made by winding wire into a coil, often around a core material, to create inductance.
Inductors are constructed by winding wire into a coil shape. The coil can be air-wound (no core) or wound around a magnetic core (ferrite, iron, etc.) to increase inductance. The number of turns, coil diameter, and core material determine the inductance value. This coil structure is what creates the magnetic field and stores energy. Inductors are essential in RF circuits for tuning, filtering, and impedance matching.
Exam Tip
Inductor = Coil of wire. Remember: Inductors are typically constructed as coils of wire, often wound around a core, to create inductance and store energy in a magnetic field.
Memory Aid
"**I**nductor = **C**oil of **W**ire (think 'I = CW')"
Real-World Application
You're building a resonant circuit for your antenna tuner. You wind wire into a coil to make an inductor. The coil shape creates inductance - the more turns, the higher the inductance. This coil structure is fundamental to how inductors work.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Switches are mechanical or electronic devices that open or close circuits. They're not constructed as coils of wire - they're contact mechanisms.
Option B: Incorrect. Capacitors are constructed with conductive plates separated by a dielectric, not as coils of wire. They have a different structure.
Option C: Incorrect. Diodes are semiconductor devices made of semiconductor material, not coils of wire. They have a PN junction structure.
题目解析
The correct answer is D: Inductor. An inductor is the electrical component typically constructed as a coil of wire. Inductors are made by winding wire into a coil, often around a core material, to create inductance. Inductors are constructed by winding wire into a coil shape. The coil can be air-wound (no core) or wound around a magnetic core (ferrite, iron, etc.) to increase inductance. The number of turns, coil diameter, and core material determine the inductance value. This coil structure is what creates the magnetic field and stores energy. Inductors are essential in RF circuits for tuning, filtering, and impedance matching.
考试技巧
Inductor = Coil of wire. Remember: Inductors are typically constructed as coils of wire, often wound around a core, to create inductance and store energy in a magnetic field.
记忆口诀
**I**nductor = **C**oil of **W**ire (think 'I = CW')
实际应用示例
You're building a resonant circuit for your antenna tuner. You wind wire into a coil to make an inductor. The coil shape creates inductance - the more turns, the higher the inductance. This coil structure is fundamental to how inductors work.
错误选项分析
Option A: Incorrect. Switches are mechanical or electronic devices that open or close circuits. They're not constructed as coils of wire - they're contact mechanisms. Option B: Incorrect. Capacitors are constructed with conductive plates separated by a dielectric, not as coils of wire. They have a different structure. Option C: Incorrect. Diodes are semiconductor devices made of semiconductor material, not coils of wire. They have a PN junction structure.
知识点
Inductor, Coil of wire, Component construction, Electronic components
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.