05Invisible Technology
How Does an Induction Cooktop Heat a Pan?
An induction hob heats the pan, not the glass. Here is how a rapidly alternating magnetic field drives currents inside steel cookware and why…
05Topic
Invisible Technology
The systems that work out of sight: wireless charging, RFID, NFC, touchscreens, batteries and codes. What is happening between the device and the signal, explained without hand-waving.
05Invisible Technology
How Does a Touchscreen Detect Your Finger?
Your phone screen does not feel pressure. It measures tiny changes in an electric field at hundreds of grid points, and your finger is…
05Invisible Technology
Why Do Batteries Gradually Lose Capacity?
Rechargeable batteries lose capacity because side reactions slowly use up lithium and damage the electrodes. Here is what happens inside, and what speeds it…
05Invisible Technology
How Does a QR Code Store Information?
A QR code stores data as a grid of dark and light squares, with built-in markers and error correction. Here is how the pattern…
05Invisible Technology
How Does Wireless Charging Actually Work?
A wireless charger is a transformer split in two. A coil in the pad creates a changing magnetic field, and a coil in your…