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Power Surge
temporary but gradual increase of voltage on a power line
Power Spike
very short pulses of energy on a power line that contain very high voltages
Blackout
complete loss of power
Brownout
Reduced amount of power
Surge Suppressors
Devices used to prevent damage to some devices from spikes and surges
UPS (uninterruptible power supply)
supplies power to devices in case there are decreases in power