In the prior unit, Circuits and Switches, students learned how binary numbers 0 and 1 are represented in electrical states (on/off). In the Digital Information unit, students learn how binary numbers can actually be used to create a language and logic for digital devices.
Understanding some of the ways computers represent, process, and display letters, numbers, sounds, and images
Comparing the binary number system to the decimal number system
Adding binary numbers
Using binary numbers to represent the alphabet (ASCII)
Decision-making with AND/OR statements
Goals and Objectives
Students will learn:
How the binary system can be used to represent images
What a pixel is and how it's used to represent images
How the two-state (on and off) nature of transistors can be used to represent information
How to convert decimal numbers to binary numbers and vice versa
How to add binary numbers
How to represent letters of the alphabet with the 8-bit ASCII code
Have students complete the online activities: Throughout the unit, facilitate the development of new vocabulary introduced in this unit.
Students who are not at the computer can work on supplemental lesson ideas and group activities.
After students complete the online materials, they can:
Demonstrate their knowledge of the one-to-one correspondence between binary-counting numbers and decimal-counting numbers by completing the table of values online or in the Binary Numbers Student Handout
Perform simple addition problems between two binary numbers, and check their answers
Suggest a list of other items that can be represented by a binary system, such as the possible answers in a yes/no survey, a true/false test, a game of 20 questions, and so forth
Explain in their own words why ASCII code is used and what it's used for
The following handouts can be used with this unit to enhance learning. Each handout is briefly described below. To see the actual handout, click the link "handout."
This unit defines the Internet, then explains the World Wide Web, hypertext, URLs, packets, bandwidth, connection choices, search engines, and the need to critically evaluate the quality of the information found on the Web.
This unit discusses the impact technological advances have on people's lives, with examples from the past and current day. Several readings provide insights on ways the digital age is already affecting our lives, the accelerating rate of change, and what we might expect to see in the near future.