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A prolonged electrical power supply that is below norma…

A prolonged electrical power supply that is below normal voltage is a:

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A.
brownout

B.
blackout

C.
surge

D.
fault

Explanation:
When power companies are experiencing high demand, they frequently reduce the voltage in an electrical grid,
which is referred to as a brownout. Constant voltage transformers can be used to regulate this fluctuation of
power. They can use different ranges of voltage and only release the expected 120 volts of alternating current
to devices.
Interference interrupts the flow of an electrical current, and fluctuations can actually deliver a different level of
voltage than what was expected. Each fluctuation can be damaging to devices and people.The following explains the different types of voltage fluctuations possible with electric power:
Power excess:
Spike Momentary high voltage
Surge Prolonged high voltage
Power loss:
Fault Momentary power outage
Blackout Prolonged, complete loss of electric power
Power degradation:
Sag/dip Momentary low-voltage condition, from one cycle to a few seconds
Brownout Prolonged power supply that is below normal voltage
In-rush current Initial surge of current required to start a load
Incorrect Answers:
B: A blackout is a prolonged complete loss of power, not a prolonged low voltage. Therefore, this answer is
incorrect.
C: A surge is a prolonged high voltage, not a prolonged low voltage. Therefore, this answer is incorrect.
D: A fault is a momentary power outage, not a prolonged low voltage. Therefore, this answer is incorrect.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 462-463


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