Logic gates are the fundamental building blocks of digital electronics, acting as the microscopic switches that perform logical operations on binary data (1s and 0s). In a physical computer, these gates are built using combinations of transistors, which control the flow of electrical voltage to represent binary states (High Voltage = 1, Low Voltage = 0).
By chaining millions or billions of these simple gates together, computers can perform complex tasks, run software, and calculate arithmetic. The Three Basic Gates These gates form the core foundation of Boolean logic.
AND Gate: Outputs 1 only if all inputs are 1. If any input is 0, the output is 0. Think of it like two safety switches that both must be flipped to turn on a machine.
OR Gate: Outputs 1 if at least one input is 1. It only outputs 0 if all inputs are 0. It functions like a room with two light switches wired in parallel; hitting either turns on the light.
NOT Gate (Inverter): Features exactly one input and one output. It reverses the signal completely: an input of 1 becomes 0, and an input of 0 becomes 1. Universal Gates
NAND and NOR are called “universal gates” because any other logic gate or complex circuit can be built entirely out of just one of these types.
NAND Gate: An AND gate followed by a NOT gate. It outputs 0 only when all inputs are 1; otherwise, it outputs 1.
NOR Gate: An OR gate followed by a NOT gate. It outputs 1 only when all inputs are 0; if any input is 1, it outputs 0. Advanced / Derived Gates
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