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How burglar alarms work?

Answer:
Burglar alarms work when the set circuit is broken for some reason. For example, if I set an alarm for my house and someone opens a window that should not be opened, it trips a bell or alerting sound that a circuit is opened when it shouldn't be.
First answer by Answers Publishing Network. Last edit by Answers Publishing Network. Contributor trust: 96 [recommend contributor recommended]. Question popularity: 64 [recommend question].

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Relevant answers:

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