NAME ASMA O MNYANI SCHOOL LUGOBA SECONDARY SCHOOL

NAME: ASMA O. MNYANI SCHOOL: LUGOBA SECONDARY SCHOOL REGION: PWANI COUNTRY: TANZANIA SUBJECT: PHYSICS TOPIC: ELECTRONICS SUBTOPIC: LOGIC GATES DATE OF SUBMISSION: 31/07/2018

PHYSICS FORM SIX ELECTRONICS LOGIC GATES

LEANER’S OBJECTIVES After this lesson the students should be able to; �Discuss the various types of logic gates �Create truth tables for NOT, AND, and OR gates and other derived logic gates

INTRODUCTION �Assume that you are a business strategist in a certain company where either you or your colleague has to approve a business plan prepared by your subordinate. But, your boss makes the final decision. So, there are 2 phases �Approval by either of two strategists �Approval by the manager

INTRODUCTION �Since only either of you or colleagues approval is needed. �Whatever a decision needs to be taken based on some inputs can be designed �a decision making element is called a LOGIC GATE

Lesson review (class discussion) �You would of course want our doorbell to ring when someone presses either the front door switch or the back door switch �You would like the central heating system to heat the house if temperature fall bellow 20 degree centigrade �You would like the burglar alarm to ring if the burglar enters while going out of the house

CHECK THIS VIDEO

Question (class discussion) From the video we have observed, �What is logic gates? �Identify the types of logic gates shown in this video?

LOGIC GATES Logic gates � Is a circuit that produces one output voltage which is either low/high depending upon the levels of input voltage/voltages Truth table � Is the one shows all the possibilities and corresponding Or � Is the one which shows the relationship between input and output

BASIC LOGIC GATES There are three logic gates �NOT gate �OR gate �AND gate �Combination of basic logic gates lead to another types of logic gates, namely �NAND gate �NOR gate � EXCLUSIVE OR gate(XOR)

NOT GATE Is the gate with only one input and one output

TRUTH TABLE OF NOT GATE

OR GATE This is the gate which have many number of inputs but only one output. It gives high output if either of the input is high or all inputs are high

TRUTH TABLE OF OR GATE

AND GATE Is the gate with many number of input but only one output. It gives high output when both input are high

TRUTH TABLE OF AND GATE

NOR GATE This is equivalent to OR and NOT gate. All outputs of OR gate are inverted

TRUTH TABLE OF NOR GATE

NAND GATE This is the NAND gate followed by NOT gate. In this case the output of AND gate are inverted

TRUTH TABLE OF NAND GATE

EXCLUSIVE OR GATE(XOR) Is the gate which gives high output if either of the input is high but not when both inputs are high

TRUTH TABLE OF EXCLUSIVE OR GATE

Questions(individual work) 1. What is meant by the following electronics circuit �Logic gates �Truth table 2. Give symbols expressions and truth table of the following logic gates �NAND gate �EXCLUSIVE OR gate �OR gate

GOOD BYE!!!!!!