Lesson Notes By Weeks and Term - Senior Secondary 2

Logic circuits

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Term: 1st Term

Week: 5

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 2 periods each

Date:

Subject:      Computer Studies and ICT

Topic:-       Logic circuits

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

  1. Define logic gates
  2. Mention and explain the types of logic gates

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, pictures, Data Processing for senior Secondary Education by Hiit Plc, WAPB Computer Studies for Senior Secondary II by Adekunle et  al, On-line Materials.

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S ACTIVITY

STEP 1

INTRODUCTION

The teacher reviews the previous lesson on Conversion of from one unit of storage to another

Students pay attention

STEP 2

EXPLANATION

He defines Logic gates

 

Students pay attention and participates

STEP 3

DEMONSTRATION

He mentions and explains the types of logic gates

Students pay attention and participate

STEP 4

NOTE TAKING

The teacher writes a summarized note on the board

The students copy the note in their books

 

NOTE

LOGIC GATES

A logic gate is the fundamental building block of digital integrated circuits. Most logic gate takes an input of two binary values, and output a single value of 1 or 0. Some circuits may have only a few logic gates, while others, such as microprocessors, may have millions of them. Logic gates are primarily implemented using diodes or transistors acting as electronic switches, but can also be constructed using vacuum tube, fluidic logic, optics, molecules or even mechanical elements.

Logic circuit includes such devices as registers, arithmetic logic units, and computer memory, all the way up through complete microprocessors, which may contain more than 100 million gates.  

Types of logic circuit

There are mainly 3 logic gates, they are:

  1. OR gate
  2. AND gate
  3. NOT gate

OR gate:the OR gate is a circuit that has two or more inputs and operates in such a way that:

  1. Its output is 1 when any of the input variables is 1
  2. Its output is 0 if when all of the input variables are 0
  3. Its output is 1 when all of the input variables are 0

The algebraic symbol of the OR operation is the plus sign (+).

 It can also be generated using the equation : X=A+B

 

  1. AND gate:The AND gate is a circuit that has two or more inputs and operates in such a way that:
    1. Its output is 1 if and only if the two inputs are 1
    2. Its output is 0 if any of the inputs is either 0 or 1 or both are 0

The algebraic symbol of the AND gate is * or . .

  1. NOT gate:This is the logic gate that has one input and one output such that when the input is true (1), the output is false and when the input is false, the output is true.

 

EVALUATION:    1. Define Logic gates

  1. List and explain the types of logic gates

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively