A security system at a rum distillery in Jamaica uses a logic circuit to control access. The alarm sounds (output = 1) only when the door is open (A = 1) AND the security code is NOT entered (B = 0). Which logic gate combination would produce this output?

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Question

A security system at a rum distillery in Jamaica uses a logic circuit to control access. The alarm sounds (output = 1) only when the door is open (A = 1) AND the security code is NOT entered (B = 0). Which logic gate combination would produce this output?

Accepted Answer

A AND (NOT B) — Award 1 mark for recognising that the alarm requires door open (A = 1) AND code not entered (NOT B = 1). A is incorrect — this would require both door open AND code entered. B is incorrect — this uses OR logic which is not the specified condition. D is incorrect — OR logic would trigger alarm in wrong situations.

Answer

A OR B

Answer

A OR (NOT B)

Answer

A AND (NOT B)

Answer

A AND B

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