| 摘要 |
An electrical receptacle has a female socket with two receiving terminals for receiving the two prongs of a male plug. Each of the receiving terminals has two electrically separated contact elements. One contact element from each of the two receiving terminals is interconnected to the main source of electric power. The other contact element from each of the two receiving terminals is connected through a switch to an alarm. When the male plug is inserted into the socket, it electrically conducts current from the first contact element to the second contact element in each of the receiving terminals, to thereby maintain the switch in one of its two positions to prevent the alarm from being energized. However, when the plug is removed from the socket, the switch moves to its second position and the alarm is energized. In an embodiment of the invention, the electrical receptacle is interconnected to the alarm in parallel with a burglar alarm system contained on the premises and both a main and auxiliary power supply are provided to thereby ensure that the burglar alarm system is constantly energized, but only connecting the electrical receptacle to the alarm when the main house current is available.
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