As with resistors, capacitors can also come in a great range of different packages. The role of capacitors is to store electrons.
Remember the water tank? Think of a hand pump at a well. The water comes out of the pump in spurts. If the water is held in a water tank, a valve can be opened, getting a continuous stream of water. So, a capacitor can behave like a water tank to smooth out uneven electrical flow.
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