Question about Electrical Supplies
Depending on brand/age it may be a normally closed relay which would be open when the 110 line voltage is present and closed when the voltage drops out. connected in line between the battery and the bulb in the unit, when the power goes out the relay closes completing the circuit between the battery and the bulb and causing it to illiminate it.
Some newer more sophisticated models have electronic systems that provide essentially the same functionality
Posted on Jan 04, 2009
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Posted on Jan 02, 2017
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