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The main purpose of a capacitor in an electrical circuit is to store electrical energy temporarily. Capacitors can accumulate and store charge, which allows them to release energy back into the circuit when needed. This property is particularly useful in various applications, such as smoothing out voltage fluctuations in power supplies, filtering noise in signals, and providing bursts of power in timing applications.

When a capacitor is connected to a voltage source, it charges up to the voltage of that source, storing energy in an electric field created between its plates. Once charged, it can discharge this energy in a controlled manner, which is essential for maintaining stable voltage levels in circuits and enabling the functioning of devices that require precise energy timing.

Understanding this role highlights the importance of capacitors in electronics and electrical systems, making them crucial components for efficient circuit design and performance.