π Key Concepts
β’ Identify each logic gate in figure 2 (AND, OR, inverter, and which ones are inverted outputs with a bubble).
β’ Remember the basic truth tables for AND, OR, NAND, and NOR when both inputs are 0.
β’ Track how the signal flows from A and B through C, D, then through the inverter to E, and finally into the last gate that produces F.
π Think About
β’ When both A and B are 0, what is the output of the upper gate before and after the bubble on its output? Label that as C.
β’ For the lower gate fed by A and B, what does the output bubble do to the normal OR result, and how does that value change again after passing through the separate inverter to become E?
β’ Once you know C and E, what kind of gate is the final one, and what output F does it give for those two inputs?
β
Before You Answer
β’ Be sure you recognize that a small bubble on a gateβs output means logical inversion (NOT) of that gateβs normal output.
β’ Verify each intermediate value step-by-step: first find C and D from A and B, then find E from D, and only then compute F from C and E.
β’ Double-check that you are using the correct truth table for each gate type (AND vs OR, NAND vs NOR) when both inputs are 0.