blackout

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Related to Black Outs: 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 ?
Jack: I was just a boy of 10 or so when the black outs began.
ABB solutions will help prevent black outs and disturbances in operations with millisecond analysis.
They may also develop physical signs of harm such as headaches, upset stomachs, anxiety attacks and even black outs and fits totally brought on by the stress of being bullied.
POWER black outs and energy crisis in the country are being exploited by the pronuclear lobby to push for atomic power regardless of issues related to safety, environment and cost, anti- nuclear experts have said.
The Llandudno hearing was told how Norwich City FC fan Mark, who had previously suffered several black outs, was having a kickabout with friends in Glan Conwy on Thursday February 24.
Describing symptoms of "headaches, black outs, losing balance and mood swings" that could be down to the amount of alcohol he drinks, there's another explanation.