Capacitor

A capacitor is a component made of two or sets of two conductive plates with a thin insulator between them and wrapped in a ceramic and plastic container. When the capacitor receives a DC (direct current), a positive charge builds up on the plate (or set of plates) while a negative charge builds up on the other. This charge, which is measured in microfarads on a computer capacitor, remains in the capacitor until it is discharged.

Electrolytic capacitor on a computer motherboard
Another common type of capacitor is an electrolytic capacitor, which is a higher capacitance capacitor in a smaller package. The picture to the bottom right is an example of these types of capacitors.

Like any other component in a computer, capacitors in a computer can fail, and when they do can cause the computer or the component to fail. When a motherboard capacitor fails the computer will no longer boot, and the capacitor needs to be replaced or a new motherboard needs to be put in the computer.

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