Question
What is the function of a power supply bleeder resistor?
Answer Options
- A) It acts as a fuse for excess voltage
- B) It discharges the filter capacitors when power is removed
- C) It removes shock hazards from the induction coils
- D) It eliminates ground loop current
Correct Answer: B
Explanation
A bleeder resistor is a high-value resistor connected directly across the output of a power supply’s filter capacitors. These filter capacitors store electrical energy and can retain a high voltage even after the power supply has been turned off, posing a serious electrical shock hazard.
The primary function of the bleeder resistor is safety: it discharges the filter capacitors when power is removed. By providing a continuous, small path for current to flow, the resistor safely drains the stored charge within a few seconds or minutes, eliminating the shock hazard before the power supply casing might be opened for service.
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