What causes an electric smoke detector to beep?

Answer

Electric smoke detector produces a beeping sound when the battery is low warning that the unit is losing its functionality slowly. This sound is mainly meant to warn the owner to replace the old battery with new ones.
Q&A Related to "What causes an electric smoke detector to beep..."
According to Fire Safety for Citizens, dying from fires and related burns ranks 5th in the United States for people who die from unintentional injuries. A 2006 report states that
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Take out the battery.
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A smoke detector is set off when the smoke is thick enough to break a
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even though it is hard wire to your electircal you still need to replace the 9 volt battery at least once a year or the chirp and beep will continue they are still battery back up.
http://aolanswers.com/questions/diy_5183121219866
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