Which component typically needs to have high voltage discharged before servicing?

High voltage discharging is particularly critical for capacitors before servicing because they can store electrical energy even after the power has been shut off. Capacitors are used in various electronic circuits to smooth out voltage fluctuations and filter signals, which means they can retain a significant amount of charge. If a technician were to service a circuit without properly discharging the capacitor, they could encounter a dangerous shock or even damage the equipment.

In contrast, while other components such as diodes, resistors, and transformers play essential roles in circuits, they do not store energy in the same way capacitors do. Diodes primarily rectify current and do not hold charge, resistors limit current flow, and transformers transfer electrical energy between circuits but are not typically associated with high energy storage like capacitors. Thus, the need to discharge a capacitor before servicing is paramount to ensure safety and protect both the technician and the equipment.