Question

4. The NOR gate output will be high if the two inputs are​

Answer 1

Answer: low.

Explanation: it's negation of OR gate. In OR gate the output will be low only when both inputs are low. So as opposed to this, in nor gate the output will be high only when both inputs are low. It's used in active-low circuits since it give high output on low input.

Answer 2

The NOR gate output will be high if the two inputs are​ low.

• A nor gate is a negation of OR gate.
• The symbolic representation of Two OR gates A+B as a NOR gate is = $(A+B)^{'}$

In a NOR gate, the truth table has the following results:

• A=0, B=0, A+B =0, $(A+B)^{'}$= 1

• A=0, B=1, A+B=1, $(A+B)^{'}$= 0

• A=1, B=0, A+B=1, $(A+B)^{'}$= 0

• A=1, B=1, A+B=1, $(A+B)^{'}$= 0

Hence, from the results of the truth table, it is clear that when two inputs A and B are low (i.e., 0) then the NOR gate has high input.