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Digital Electronics and Logic Gates
Quick questions on NAND and NOR gates explained: O-Level Electronics Digital Electronics
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the NAND gate?Show answer
NAND stands for NOT-AND: it is an AND gate followed by a NOT gate. Its output is the inverse of the AND output, so it is logic 0 only when all inputs are 1, and logic 1 in every other case. The Boolean expression is:
What is the NOR gate?Show answer
NOR stands for NOT-OR: it is an OR gate followed by a NOT gate. Its output is the inverse of the OR output, so it is logic 1 only when all inputs are 0, and logic 0 in every other case. The Boolean expression is:
What is making a NOT from a NAND?Show answer
The most useful trick is turning a NAND into an inverter: tie both inputs together (or hold one input at logic 1). Then the output is the inverse of the common input, exactly the NOT function. This is the building block that lets NAND gates make every other gate.
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