A power sag

A power sag is an opposite of a power spike. If a power spike is a sudden increase in voltage, then power sag is a decrease because n voltage. Power sags may cause a computer to shutdown and the data that it is in it maybe lost. To eliminate impact of power sags an Uninterruptible Power Supply (short form UPS) needs to be used.

UPS will prevent not only from power sags but from complete loss of power. Please think of UPS as a battery. It will not last forever, but if UPS is used it has enough time to save the data and safely turn off the computer.

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