Logic

What is a logic gate?

A device that acts as a building block for digital circuits.

What does a logic gate perform?

Basic logical functions that are fundamental to digital circuits, controlling the flow of electricity in the circuit.

What do most electronic devices we use today contain?

Logic gates

How do logic gates work in a circuit

They work based on a combination of digital signals coming from its inputs.

What types of signals can a logic gate take?

High (1 - full voltage); Low (0 - zero voltage)

How many inputs and outputs does a logic gate have?

Usually 2 inputs, Always 1 output

How is the output of a logic gate related to its gate?

It is unique to it

What are truth tables for?

To verify the output of a logic circuit

Which are the 6 most common logic gates?

Not, And, Or, NAnd, NOr, XOr

What is NOT?

Will output the opposite of the input (1 input) - triangle with dot after

What is AND?

Will only output 1 if both inputs are 1 - elongated semicircle

What is OR?

Will output 1 if either of the inputs is 1, or both - rocket shape

What is NAND?

Will output 1 unless both inputs are 1 - elongated semicircle with dot after

What is NOR?

Will only output 1 if neither input is 1 - rocket shape with dot after

What is XOR?

Will output 1 if one input is 1, but not both - rocket shape with extra line at base

What logic gate would be used for a Burglar Alarm?

AND - if both person sensor and alarm switch are on, alarm is activated

What logic gate would be used for a doorbell?

OR - if either the front or back door bell switch is on, door bell sounds

When would logic gates be combined?

In circuits to address more complex scenarios.

How are truth tables set out?

With all inputs as all the binary options.