Representing text

In this lesson, you will look at character coding systems. First, you will consider character coding systems that you might have come across before, such as semaphore and Morse code, then you will be introduced to ASCII, a standard coding system for representing text. Next, you will learn about the need for Unicode to extend ASCII. Finally, you will learn how to work out the size of a plain text file.

Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

  • Click "Close Video"
  • Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Representing Text

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.How many characters are in the ASCII character set?

1/3

Q2.How many bits of storage are used for each character?

2/3

Q3.What is the name for the character set that was introduced after ASCII and can hold thousands of characters?

3/3

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Representing Text

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.How many characters are in the ASCII character set?

1/3

Q2.How many bits of storage are used for each character?

2/3

Q3.What is the name for the character set that was introduced after ASCII and can hold thousands of characters?

3/3

Lesson summary: Representing text

It looks like you have not completed the quiz.

To share your results with your teacher please complete the quiz.

Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Dance

Browse Oak's lessons: