December 9, 2020

How does a radio work?

Radio signals are heard almost everywhere. But how does a radio work? The radio transmitter (where the sounds come from) changes sound waves into electrical signals. […]
December 9, 2020

How does television work?

Did you know that the pictures on TV are a jumble of red, green, and blue dots? When you sit across the room, the dots blend […]
December 11, 2020

How does a remote control work?

Have you ever tried to switch channels on TV when someone stood in the way? Nothing happened. Why not? The transmission of the signal was blocked. […]
December 11, 2020

How does radar work?

Aeroplanes get into traffic jams just in the same way cars do-especially around busy airports. But people called air traffic controllers know where each plane is […]