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Known as power spikes, surges, brownouts, and blackouts, these fluctuations can cause anything from fire to data loss in an unprotected laptop computer. When power returns, it can come in a rush, rising significantly above standard household voltage levels to burn wires, overwhelm circuits and potentially cause damage to laptops, adapters, and any external peripherals that may be connected to the computer. Even when the power surge is not strong enough to knock out a system, it can slowly damage the computer's components, reducing its reliability and lifespan. A surge protector diverts the extra voltage from a power surge to a ground wire, sparing harm to any connected electrical devices.

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