Lesson Notes By Weeks and Term - Senior Secondary 1

Output devices: Printer

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Term: 2nd Term

Week: 2

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 2 periods each

Date:       

Subject:      Computer Studies and ICT

Topic:-       Output devices: Printer

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

  1. Define Printer
  2. State the functions of printers
  3. List some common examples of printers and their differing features

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

INSTRUCTIONAL MATERIALS: Videos, loud speaker, pictures, Data Processing for senior Secondary Education by Hiit Plc, WAPB Computer Studies for Senior Secondary I by Adekunle et al, On-line Materials.

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S ACTIVITY

STEP 1

INTRODUCTION

The teacher reviews the previous lesson on output devices and monitor

Students pay attention

STEP 2

EXPLANATION

He defines printer stating its functions

 

Students pay attention and participates

STEP 3

DEMONSTRATION

He gives examples of printers and discusses their differing features

Students pay attention and participate

STEP 4

NOTE TAKING

The teacher writes a summarized note on the board

The students copy the note in their books

 

NOTE

PRINTER

A printer is a device attached to the System Unit through the USB cable or other types of cable. It is used to produce the information showing on the monitor on paper, transparencies, and plastic. Such a printout is called a hardcopy

Types of printer

There are two types of printer, namely impact and non-impact printers.

  1. IMPACT PRINTERS:This type of printer behaves like a typewriter whereby a character is printed when a metal slug strikes on a carbon ribbon. Impact printers have contact with the surface of the paper. Examples of impact printer include the following:
  2. DOT MATRIX printer:This prints characters and graphic images by impacting a ribbon and transferring dots of ink onto the paper. It prints dot matrix characters by pressing the end of selected wires against ribbon and paper. The dots are used to form the characters and images on the paper.
  3. LINE printer:This prints a line of character at a time. The output speed is between 200 to 3000 lines per minute (LPM)
  4. CHARACTER printer:This prints one character at a time moving across the paper. The output speed range from 200 to 400 characters per second (cps)

 

  1. NON-IMPACT PRINTER

Non-impact printer creates images on paper in a manner similar to that of a photocopying machine. They do not have contact with the surface of the paper. Examples include:

  1. INK JET printer:This prints by spraying small streams of quick-drying ink onto the paper and using it to form characters, shapes and images. The ink is stored in disposable ink cartridges, which can be black or coloured. They are found in homes and offices.
  2. LASER printer:This uses an electrically charged drum to transfer toner or dry ink onto paper like the photocopier does. It traces an image by using a computer-controlled laser beam.
  3. THERMAL printer:This prints by transferring dots of ink or dye from a ribbon onto paper and passing the ribbon and the paper across a line of heating elements. The characters are produced with a print head containing a matrix of small heating elements. This printer is very quiet in operation because the printer head does not strike the paper.

 

DIFFERENCES BETWEEN IMPACT AND NON-IMPACT PRINTER

IMPACT PRINTER

NON-IMPACT PRINTER

Makes noise while printing

Does not make noise while printing

Produces low quality images

Produces high quality images

Uses ribbon to print

Uses ink (dry and wet) to print

Does not have heating element

Has heating element that dries the ink on paper

Prints only one colour at a time

Can print more than one colour at a time

Has striking pins/heads that strike the characters or dots on paper

Does not have striking pin heads to strike characters on paper

 

 

EVALUATION:    1. Define Printers

  1. Discuss two printers under the headings, “impact”                    and non-impact printers
  2. List four examples of printer

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively