What electrical parameter is controlled by a potentiometer?
The correct answer is B: Resistance. A potentiometer controls resistance, which is the electrical parameter controlled by a potentiometer. Potentiometers are variable resistors, so they control resistance by allowing you to adjust it.
Potentiometers are variable resistors - they allow you to change the resistance value. When you turn a potentiometer, you're adjusting the resistance between the wiper terminal and the end terminals. This resistance change controls the signal level, current flow, or voltage division in the circuit. The resistance is the parameter being controlled, which then affects other circuit characteristics like current, voltage, or signal level.
Exam Tip
Potentiometer controls = Resistance. Remember: Potentiometers are variable resistors, so they directly control resistance, which then affects current, voltage, or signal levels.
Memory Aid
"**P**otentiometer = **R**esistance **C**ontrol (think 'P = RC')"
Real-World Application
You're adjusting a potentiometer in your audio circuit. As you turn it, you're changing the resistance value. This resistance change controls how much signal passes through, affecting the volume. The potentiometer directly controls resistance, which is the fundamental parameter being adjusted.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Potentiometers don't control inductance. Inductance is a property of inductors (coils), not resistors. Potentiometers are resistive components.
Option C: Incorrect. Potentiometers don't control capacitance. Capacitance is a property of capacitors, not resistors. Potentiometers are resistive components.
Option D: Incorrect. Potentiometers don't control field strength. Field strength relates to electromagnetic fields, not resistance. Potentiometers control resistance, which may indirectly affect signals, but not field strength directly.
题目解析
The correct answer is B: Resistance. A potentiometer controls resistance, which is the electrical parameter controlled by a potentiometer. Potentiometers are variable resistors, so they control resistance by allowing you to adjust it. Potentiometers are variable resistors - they allow you to change the resistance value. When you turn a potentiometer, you're adjusting the resistance between the wiper terminal and the end terminals. This resistance change controls the signal level, current flow, or voltage division in the circuit. The resistance is the parameter being controlled, which then affects other circuit characteristics like current, voltage, or signal level.
考试技巧
Potentiometer controls = Resistance. Remember: Potentiometers are variable resistors, so they directly control resistance, which then affects current, voltage, or signal levels.
记忆口诀
**P**otentiometer = **R**esistance **C**ontrol (think 'P = RC')
实际应用示例
You're adjusting a potentiometer in your audio circuit. As you turn it, you're changing the resistance value. This resistance change controls how much signal passes through, affecting the volume. The potentiometer directly controls resistance, which is the fundamental parameter being adjusted.
错误选项分析
Option A: Incorrect. Potentiometers don't control inductance. Inductance is a property of inductors (coils), not resistors. Potentiometers are resistive components. Option C: Incorrect. Potentiometers don't control capacitance. Capacitance is a property of capacitors, not resistors. Potentiometers are resistive components. Option D: Incorrect. Potentiometers don't control field strength. Field strength relates to electromagnetic fields, not resistance. Potentiometers control resistance, which may indirectly affect signals, but not field strength directly.
知识点
Potentiometer, Resistance, Variable resistor, Electrical parameter
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.