Basic Electricity - Senior Secondary 3 - Logic gates

Logic gates

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TERM: 2ND TERM

WEEK THREE

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC ELECTRICITY

Topic: LOGIC GATES

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

I.) Define logic gate

II.) Identify the types of logic gates

III.) Identify the symbol for each logic gate

IV.) State the applications of logic gates

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

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains the concept of logic gate and discuss the types of logic gates

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher draw out the symbols for each logic gate.

Teacher discusses the applications of logic gates.

Students exhibit attentiveness and active engagement

STEP 3

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 a fundamental building block of digital circuits, performing logical operations based on one or more input signals to produce an output signal. These gates implement Boolean functions, where the output depends on the logical relationship between the inputs.

Types of logic gates

Types of logic gates include:

  1. AND Gate: The output is high (1) only when all input signals are high (1).
  2. OR Gate: The output is high (1) when any of the input signals are high (1).
  3. NOT Gate (Inverter): The output is the inverse of the input signal.
  4. NAND Gate: The output is low (0) only when all input signals are high (1).
  5. NOR Gate: The output is low (0) when any of the input signals are high (1).
  6. XOR Gate (Exclusive OR): The output is high (1) when the number of high inputs is odd.

Symbols for these gates

1. AND Gate:

 

2. OR Gate:

 

3. NOT Gate (Inverter):

4. NAND Gate:

5. NOR Gate:

6. XOR Gate:

Applications of logic gates

Applications of logic gates include:

  1. Digital Electronics: Building blocks for constructing digital circuits such as computers, calculators, and digital watches.
  2. Arithmetic Operations: Performing mathematical operations like addition, subtraction, multiplication, and division.
  3. Control Systems: Implementing control logic in devices like traffic lights, industrial automation, and robotics.
  4. Memory Devices: Constructing flip-flops and registers used in memory storage.
  5. Communication Systems: Encoding and decoding signals in communication protocols like Ethernet, USB, and HDMI.
  6. Security Systems: Designing alarm systems, access control systems, and encryption algorithms.

EVALUATION: 1. What do you understand by the concept, logic gate

  1. Mention 5 types of logic gate you know
  2. Mention 5 applications of logic gates.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively