Fence Alarm
An electric fence is a device that can be used to limit areas in a terrain. There is a multitude of uses for electric fences, since if well used they can reduce the amount of man power required to maintain the safety of animals or property. They can be used to delimit areas, protect housing complexes in high rate crime areas, isolate high security facilities, limit access to pasture areas. The functioning principle of an electric fence operation can be illustrated with a simple circuit composed of a power supply, a lamp and a switch. In any electric circuit current always flows from the positive end of the power supply to the negative end. When the switch is open, the circuit its interrupted and the current cannot circulate, there for the lamp will not lit. When the switch its closed, the circuit is completed and the lamp is lit.
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