PBS
Passion for Pixels
Picture this: a fun activity for pupils to discover pixels. After learning about digital signals and pixels, scholars act as senders and receivers of an image. The sender indicates zero or one to tell whether each square in a grid is...
CK-12 Foundation
Ck 12: Physical Science: Electronic Signal
[Free Registration/Login may be required to access all resource tools.] Covers electronic signal, how an electric current can be used to send an electronic message, what analog and digital signals are, and the difference between them.