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
