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In a
closed-circuit system, electricity is flowing all the
time from one end to the other. If there's a break in the
circuit whereby the electricity can't flow, the alarm will be
triggered. In this kind of system, closed doors and windows
complete the circuit allowing electricity to flow. Whenever a
door or window is opened, the circuit is broken and thus
triggering the alarm.
In an open-circuit
system, there's no flow of electricity within the
circuit as the circuit is incomplete. Closing the
circuit will allow electricity to flow and thus activating the
alarm. In this kind of system, opening the door closes the
circuit, so electricity begins to flow.
Closed circuits are normally a better
choice because for an open-circuit system, an intruder can
deactivate the open circuit by simply cutting the connected
wires. The disconnected wires will not allow the circuit to be
completed even when part of the circuit is completed when a door
is opened.
Even with a closed circuit system, a
security system is still a flawed system without a control box.
This is because a burglar can just simply turn off the alarm
when inside the house by just closing back the door or window.
The control
panel
is hooked up to one or more alarm circuits, but it also has its
own power supply. It monitors the circuits and sounds the alarm
when they are closed or opened. But once the alarm is triggered,
the control box won't cut it off until a security code is
entered at a connected keypad. For added security, the control
box should be positioned in an out-of-the-way spot, so the
burglar can't find it and attempt to destroy it.
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