3. a security system uses sensors at every door and window which will set off analarm if any one of them is opened. there is also a keypad by an entry door toturn on or turn off the system. describe how these components can be wired in acombination circuit to provide the needed security

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 

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