A combination circuit would be needed for security because if you had a strait circuit if any one of those sensors or the keypad was ripped off the circuit will now let the flow of electricity be possible but with a combination circuit it helps eliminate that problem because even if on flow path is cut off, other paths are still available <span />
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AMPERE - a unit of measure for the flow of the current in a circut
The issue would be that the memory was not installed or was not detected by the system. If this happens, the system boot will fail and a beep code is heard. The system would not show anything since all of the software are in the memory which was not installed or detected.
Although Asia has the most poverty, it also has the most population. Hope this helps!