How Do Noise-Canceling Headphones Work?
Using destructive interference to 'erase' background sound waves.
Microphones: From Analog Air to Digital Data
Sound is a wave. Computers only know 1s and 0s. How a microphone turns your voice into electricity.
Speakers: How They Make Sound (Reverse Microphones)
A speaker is just a microphone working backwards. It uses magnets to push air. Motors work the exact same way.