blackout

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Related to Blackouts: passing out

blackout

1. a momentary loss of consciousness, vision, or memory
2. a temporary electrical power failure or cut
3. Electronics a temporary loss of sensitivity in a valve following a short strong pulse
4. a temporary loss of radio communications between a spacecraft and earth, esp on re-entry into the earth's atmosphere

blackout

[′blak‚au̇t]
(communications)
(electricity)
The shutting off of power in an electrical power transmission system, either deliberately or through failure of the system.

blackout

blackoutclick for a larger image
The relationship between acceleration and time at maximum G required to produce symptoms of grayout and blackout.
i. A condition of temporary loss of vision, possibly also loss of consciousness, resulting from the effect of high and sustained positive acceleration (g) on the body. A condition that occurs at g value higher than 1 that causes gray-out. Normally, this occurs when the body is exposed to +4 and +4.5 g for about 10 seconds or more. This can be postponed slightly by using a g-suit, by crouching, or by using a reclining seat. The onset of gray-out and blackout conditions varies from individual to individual. It is also dependent on physical conditioning.
ii. The fadeout of radio communications caused by changes in the ionosphere resulting from a nuclear explosion or ionospheric disturbances.
iii. An enforced period during which all lights in an area are turned off or concealed, so as not to be visible from the air. It is one of the passive air defense measures.

blackout

A complete loss of power. See brownout.
References in periodicals archive ?
Blackouts, which happen when people lose consciousness for a short period, affect over half of all Britons at some stage, campaigners said.
history until blackouts left parts of nearly every neighborhood in the city sweltering without air conditioning.
Relating this back to the two studies above, blackouts and large surges account for less than 5 percent of all power problems and happen in Normal Mode.
Several majjor blackouts have occurred over the past 20 years, as well as many smaller power failures--and most experts expect more of both in the future.
Generation capacity stood at only approximately 75% leading up to the Northeast blackout.
After the August 15th blackout descended on millions of Americans and Canadians in the northeast, former Clinton Energy Secretary (and current New Mexico Governor) Bill Richardson took to the airwaves to indict the free market for the catastrophe.
The only way to escape Tokyo's turgid humidity, blackouts or not, is to get away.
Although the ministry warned of the possibility of extending blackouts, one-hour power outages will be maintained for the time being because of educational examinations, which will start Thursday and continue until early January.
Gray Davis has announced a three-tiered warning system in which the first warning will come two days prior to an outage; the second warning, one day before; the third, one hour before the blackout.
But the threat of more rolling blackouts like those that hit Northern California in late January is close to intolerable, no matter what your industry.
January's blackouts in California were intended to pressure state officials to order a public bailout of the utility companies, Credit Suisse First Boston confirmed in a memo sent to its clients.