The component used in a hydraulic system to store potential energy in the form of hydraulic fluid under pressure, is the __________.

Correct Answer: Option C — accumulator

Accumulators store potential energy by compressing an inert gas (usually nitrogen) behind a bladder, piston, or diaphragm. When system demand exceeds pump capacity, the pressurized gas expands, forcing hydraulic fluid into the system to maintain pressure, dampen pulsations, or provide emergency power during pump failure.