CENTRAL PROCESSING UNIT (CPU)

Subject:

COMPUTER SCIENCE

Term:

FIRST TERM

Week:

WEEK 2

Class:

SS 2

Topic:

CENTRAL PROCESSING UNIT (CPU)

Previous lesson:

The pupils have previous knowledge of

MID TERM TEST FIRST TERM LITERATURE SS 1

that was taught as a topic in the previous lesson

Behavioural objectives:

At the end of the lesson, the learners will be able to

say the meaning of central processing units
give examples of various types of computer CPU
explain the importance of CPU
point out the need to keep and maintain

Instructional Materials:

Wall charts
Pictures
Related Online Video
Flash Cards

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Methods of Teaching:

Class Discussion
Group Discussion
Asking Questions
Explanation
Role Modelling
Role Delegation

Reference Materials:

Scheme of Work
Online Information
Textbooks
Workbooks
9 Year Basic Education Curriculum
Workbooks

WEEK 2

CLASS: SS 2

SUBJECT: COMPUTER SCIENCE

TOPIC: CENTRAL PROCESSING UNIT (CPU)

CONTENT:

Central Processing Unit

Functions of ALU and Control Unit

Control Unit

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Sub-Topic 1: CENTRAL PROCESSING UNIT

The Central Processing Unit (CPU): Is the portion of a computer system that executes the instructions of a computer program, and is the primary element carrying out the functions of the computer or other processing device. The Central Processing Unit carries out each instruction of the program in sequence, performs the basic arithmetical, logical, and input/output operations of the system.

Also, the Central Processing Unit (CPU) is the part of a computer that thinks, calculates and carries out instruction. It is also called the brain of the computer. It is sometimes called the Central Processor or simply the Processor.

A computer can have more than one CPU; this is called multiprocessing. CPU can be found in the motherboard. All the functions of the CPU are stored in a component called the chip.

COMPONENTS OF CPU

CPU consists of two main units namely;

Arithmetic Logic Unit
Control Unit

EVALUATION

In your own words, define CPU
Mention the two components of the

Sub-Topic 2: ARITHMETIC LOGIC UNIT

The ALU is a digital circuit that performs arithmetic and logical operations. The ALU is a fundamental building block of the CPU of a computer.

ALU performs the following functions:

The ALU performs basic tasks such as addition, subtraction, multiplication, division and so
The logic unit of the ALU is concerned with logical operations such as comparison (Greater than (>), less than (<), equal to (=) etc), bitwise logic operations like AND, OR, XOR etc.
ALU consists of output registers that store results of processed

CONTROL UNIT

The control unit is an important component of the CPU. It contains circuitry that uses electrical signals to direct the entire computer system to carry out stored program instructions. The control unit does not execute program instructions; rather, it directs other parts of the system to do so. The control unit must communicate with both the arithmetic/logic unit and memory. It also maintains the order of traffic and data in the computer system.

The Control Unit performs the following basic functions on instruction:

It fetches instructions from the main memory
Decodes instruction: It interprets the instructions that were fetched to determine the operation it will perform.
Execution: It controls the execution of instructions
Storing Results: The process of writing results to the memory is called storing. The control unit ensures that the output(s) gotten from the execution of an instruction are stored in the memory.

NOTE: The collection of these four functions together is referred to as Machine Cycle or Instruction Cycle of the CPU.

EVALUATION:

State TWO functions of the following;

Arithmetic Logic Unit (ALU)
Control Unit (CU)

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GENERAL EVALUATION

Highlight the components of the CPU
Explain the term ‘Machine Cycle’
State two mathematical and two relational operator symbols

READING ASSIGNMENT

Study the topic ‘MEMORY UNIT’ using your students’ textbook

WEEKEND ASSIGNMENT

The part of the computer that thinks, calculates and carries out instruction is known as………………… (a)

ALU (b) CPU (c) CU (d) Register

The unit of the CPU that does mathematical and logical operations is known as ……..

(a) ALU (b) CPU (c) CU (d) Register

The unit of CPU that coordinates and controls the operations of all other parts of the computer is called (a) ALU (b) CPU (c) CU (d) Register
In terms of computing power, the………………… is the most important element of a computer

system (a) ALU (b) CPU (c) CU (d) Register

The collection of the four functions of the control unit is referred to as …………..
- Data processing (b) Machine cycle (c) Function cycle (d) Computing cycle

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ESSAY QUESTIONS

List and explain the components of the CPU
Give THREE reasons why a CPU is considered as the brain of the computer

Conclusion

The class teacher wraps up or concludes the lesson by giving out short notes to summarize the topic that he or she has just taught.

The class teacher also goes round to make sure that the notes are well copied or well written by the pupils.

He or she does the necessary corrections when and where the needs arise.

Likely Examination Questions

CENTRAL PROCESSING UNIT (CPU)

1) What is the main component of a computer that carries out instructions and processes data?

A) Hard drive

B) Motherboard

C) CPU

D) Graphics card

2) Which type of CPU typically has higher performance levels and a faster clock speed?

A) AMD

B) Intel

C) ARM

D) Desktop

3) What is an example of a CPU operation?

A) Connecting to the internet

B) Saving a document

C) Playing a video game

D) Turning on the monitor

4) A 64-bit CPU can process data in chunks of _____ bits at a time.

A) 10

B) 32

C) 64

D) 128

5) What is the name given to CPU components that perform certain calculations and store temporary data?

A) Registers

B) Microchips

C) Memory chips

D) Cache memory

ATTEMPT THIS QUIZ TO FIND OUT ANSWERS TO THE QUESTIONS ABOVE

Tags:Computer Studies, ICT

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