What is the function of a power supply bleeder resistor?
The correct answer is B: It discharges the filter capacitors when power is removed. The function of a power supply bleeder resistor is to discharge the filter capacitors when power is removed. Bleeder resistors provide a discharge path, preventing dangerous stored voltage. For amateur radio operators, this is a critical safety feature. Understanding this helps ensure safe power supply operation.
Exam Tip
Bleeder resistor function = discharges filter capacitors when power removed. Think 'B'leeder 'R'esistor = 'B'leeds 'R'esidual charge. Provides discharge path for filter capacitors, preventing dangerous stored voltage. Not fuse, not coil safety, not ground loop - just capacitor discharge.
Memory Aid
"Bleeder resistor function = discharges filter capacitors when power removed. Think 'B'leeder 'R'esistor = 'B'leeds 'R'esidual. Provides discharge path for filter capacitors, preventing dangerous stored voltage. Critical safety feature."
Real-World Application
You turn off your power supply. The filter capacitors still hold charge (dangerous voltage). The bleeder resistor provides a discharge path, safely draining the capacitors. Without a bleeder resistor, capacitors could hold dangerous voltage for minutes or hours. This is a critical safety feature.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Bleeder resistors don't act as fuses - fuses protect against overcurrent, not voltage. Bleeder resistors are for discharge, not protection.
Option C: Incorrect. Bleeder resistors don't remove shock hazards from induction coils - they discharge capacitors, not coils. Coils aren't the issue.
Option D: Incorrect. Bleeder resistors don't eliminate ground loop current - ground loops are about multiple ground paths, not capacitor discharge. Ground loops are different.
题目解析
The correct answer is B: It discharges the filter capacitors when power is removed. The function of a power supply bleeder resistor is to discharge the filter capacitors when power is removed. Bleeder resistors provide a discharge path, preventing dangerous stored voltage. For amateur radio operators, this is a critical safety feature. Understanding this helps ensure safe power supply operation.
考试技巧
Bleeder resistor function = discharges filter capacitors when power removed. Think 'B'leeder 'R'esistor = 'B'leeds 'R'esidual charge. Provides discharge path for filter capacitors, preventing dangerous stored voltage. Not fuse, not coil safety, not ground loop - just capacitor discharge.
记忆口诀
Bleeder resistor function = discharges filter capacitors when power removed. Think 'B'leeder 'R'esistor = 'B'leeds 'R'esidual. Provides discharge path for filter capacitors, preventing dangerous stored voltage. Critical safety feature.
实际应用示例
You turn off your power supply. The filter capacitors still hold charge (dangerous voltage). The bleeder resistor provides a discharge path, safely draining the capacitors. Without a bleeder resistor, capacitors could hold dangerous voltage for minutes or hours. This is a critical safety feature.
错误选项分析
Option A: Incorrect. Bleeder resistors don't act as fuses - fuses protect against overcurrent, not voltage. Bleeder resistors are for discharge, not protection. Option C: Incorrect. Bleeder resistors don't remove shock hazards from induction coils - they discharge capacitors, not coils. Coils aren't the issue. Option D: Incorrect. Bleeder resistors don't eliminate ground loop current - ground loops are about multiple ground paths, not capacitor discharge. Ground loops are different.
知识点
Bleeder resistor, Discharge filter capacitors, Power supply safety, Capacitor discharge
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.