#FocusonExam: Computer Science – O’leve – 9th April 2020

THE NOT GATE

 characteristics of a NOT gate:

üNumber of inputs and output channels
üGraphical symbol
üBehavior (how it operates)
THE NOT GATE
Number of input and output channel
The NOT logic gate
has one input channel
and one output
channel.

THE NOT GATE

 Graphical symbol

The graphical symbols  of a logic gate is given below:

 

THE NOT GATE

How it operates

The NOT gate functions like this:

when it receives 1 as input, it gives 0 as output and when it  receives 0 as input, it gives out 1 as output.

TRUTH TABLE

The truth table is a tabular representation of how a gate operates. 

A truth table is produced by writing all possible values an input of a gate can take, then deducing the output from its behavior.

 

THE NOT GATE

Truth table

Formative evaluation 1

1.The NOT gate has at least one input channel

2.If the input of the NOT gate is the value 0, then its output will be 1.

3.If the input of the NOT gate is the variable A, then its output will be

4.The graphical symbol used to identify the NOT gate is given by: 

 

Solution to Exercise 1

1.False

2.True.

3.False

4.The graphical symbol used to identify the NOT gate is given by:

Formative evaluation 2

1.Match each input with the corresponding output:

 

 

 

2.What will be the output of the NOT gate when the input

  is 2 ? Explain your answer.

  1. Draw the truth table of the NOT gate.

Summary

So far we’ve seen that the NOT gate takes one input, puts a bar on any variable it receives as input and sends out as output. It is called an inverter since when the input carries the value 0, it gives out 1 and when it is 1, it gives out zero.

 

 

Laisser un commentaire

Votre adresse e-mail ne sera pas publiée. Les champs obligatoires sont indiqués avec *

Ce site utilise Akismet pour réduire les indésirables. En savoir plus sur comment les données de vos commentaires sont utilisées.