flashlight

Most flashlights are of no use if their batteries are dead. But you can build a flashlight that doesn’t need batteries, by harnessing the electrical power generated from a magnet…

Flashlights are handy tools you may never think about until you actually need one. Invented in 1902, flashlights are simple electrical devices everyone should have on hand for emergencies. Creating…

Flashlights using incandescent bulbs go through their batteries quickly, unlike those that use LEDs as the light source. You can make an LED Torch (or “flashlight”) that will be able…