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Basic Logic Gates
12 questions By Tony R. Kuphaldt
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Question 1 of 12
Identify the type of logic gate shown in this schematic diagram, and explain why it has the name it does:
Reveal answerThis is an inverter gate, so named because its output is always the opposite (inverted) state as the input.
Note: inverter gates are often shown like this instead:
Note: inverter gates are sometimes referred to as NOT gates, because when the input is high, the output will not be high.
Notes:Your students should have no great difficulty identifying this particular logic gate if they have a good digital electronics reference book at their disposal.
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Question 2 of 12
Identify the type of logic gate shown in this schematic diagram, and explain why it has the name it does:
Reveal answerThis is an AND gate, so named because its output goes high only if input A is high and input B is high.
Follow-up question: show how a light-emitting diode could be connected to the output of this logic gate to provide visual indication of its output state.
Challenge question: show how this logic gate could drive a high-current load such as a solenoid or an electric motor.
Notes:Your students should have no great difficulty identifying this particular logic gate if they have a good digital electronics reference book at their disposal.
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Question 3 of 12
Identify the type of logic gate shown in this schematic diagram, and explain why it has the name it does:
Reveal answerThis is an OR gate, so named because its output goes high if either input A is high or input B is high.
Follow-up question: replace the two SPDT switches with SPST switches, complete with pullup or pulldown resistors as necessary.
Notes:Your students should have no great difficulty identifying this particular logic gate if they have a good digital electronics reference book at their disposal.
