Third Term Computer Lesson Note for JSS1
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Scheme of work for 3RD TERM
WEEK 1 REVISION
Computer Processing
Computer processing is an action or series of actions that a microprocessor, also known as a central processing unit (CPU), in a computer performs when it receives information. The CPU is a type of electronic “brain” for a computer system, and it executes a series of instructions that are fed to it by software programs installed onto a computer’s hard drive and loaded into random access memory (RAM). Though modern computer systems have become much faster and more complex than their earlier counterparts, they still perform the same basic type of computer processing.
Speed
The data processed using computer system is done at a very fast rate which other machine cannot.Speed of computer maybe defined as the time taken by a computer to perform a task. It takes only a few seconds for the calculations that we take hours to solve. Its speed is measured in term of MHZ (Mega Hertz).
Accuracy
The computers are the accurate machine that can perform large number of tasks without errors, but if we feed wrong data to the computer it returns the same wrong information called GIGO (Garbage In Garbage Out).
Reliability: Computers are the most reliable machine that has ever Exist in human history therefore any information obtained from computer processed data is highly reliable.
Diligence
The capacity of computer of performing repetitive task without getting tired is called diligence. A computer is free from tiredness, lack of concentration, fatigue etc therefore it can work for hours without creating any errors.
Versatility
The capacity of computer of performing more than one task at the same time is called versatility of computer. Versatility means the capacity to perform different types of work completely.
Storage
Computer has mass storage section where we can store large volume of date for future use. Such data are easily accessible when needed. Magnetic disk, magnetic tape and optical disk are used as mass storage devices
Automatic
Computer is an automatic machine which works without the intervention of the user. The user is required to give the data and utilize the result but the process is automatic.
WEEK 3
Device
In general, a device is a machine designed for a purpose. A computer can be considered a device.
In the context of computer technology, a device is a unit of hardware, that is capable of providing input to the essential computer, receiving output or even performing both input and output operation. Computer devices can be referred to as hardware components such as: keyboards, mouse, display monitors, hard disk drives, CD-ROM players, printers, audio speakers and microphones, and other hardware units.
Peripherals are sometimes used as synonyms for devices or any input/output unit.
Class of devices
1. Mechanical devices :
A machine is a tool containing one or more parts that uses energy to perform an intended action. Machines are usually powered by mechanical means. An example of mechanical device is a Generating set.
2. Electrical device :
A device that produces electricity or powered by electricity. Electrical circuit devices have no decision making capability: Example is an electric Iron
3. Electronic Device :
This is a device that accomplishes its purpose electronically with the capability of making decisions. These include lightweight consumer electronic device that looks like a hand-held computer which has operational capabilities.
WEEK 4
TYPES OF COMPUTER
There are three basic kinds of computers. The following are the three types.
Digital Computer
a computer that processes information in digital form. They convert the data into digits (binary digits 0 and 1) and all operations are carried out on these digits at extremely fast rates. Digital Computers are much faster than analog computers and far more accurate. Computers used for business and scientific applications are digital computers.
Analog Computer
A computer that represents data by measurable quantities in order to solve a problem, rather than by expressing the data as numbers. Computations are carried out with physical quantities such as voltage, length, current, temperature etc. for example voltmeter, Speedometer, ammeter. Analog computers operate by measuring rather than counting, but accuracy is poor. An electronic weighing scale is an example of an analog computer.
Hybrid Computer
Hybrid computers utilize the best qualities of both the digital and analog computers. In these computers some calculations take place in analog manner and rest of them take place in digital manner. Hybrid computers are best used in hospital where analog part is responsible for measurement of patient’s heart beat, blood pressure, and then the operation is carried out in digital fashion to monitor patient’s vital sign. Hybrid computers are also used in weather forecasting.
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