?  Library of Wonders The Wonder of Sound

How does a TV show images?

It’s amazing how TVs show our favorite programs on a screen every day. But how do images recorded in another place get to your TV?

When a TV station sends out images of a person, each picture is first cut into 525 lines. Then each of the lines is turned into the words of electricity, called electric signals. The electric signals are sent through the air from the TV station’s antenna. Your TV receives each of the lines one by one and then puts them in order from top to bottom to piece together the original picture. TV images are sent at a speed of 30 pictures every second. This is why the pictures appear to move on your TV screen.