What hazard exists in a power supply immediately after turning it off?
Circulating currents in the dc filter
Leakage flux in the power transformer
Voltage transients from kickback diodes
Charge stored in filter capacitors✓الإجابة الصحيحة
الشرح
The filter capacitors in a power supply store energy and can stay charged to hazardous voltage for a long time after the supply is switched off and unplugged. The stored charge is the reason equipment must be discharged and verified before anyone works inside it.