The simple Diode and LED Tester presented here costs under £5 to build (including all components, the battery and a cheap case) and will indicate the polarity of almost all types of LED and other ...

I n an idealized diode, no reverse current flows from cathode to anode when the device is reverse-biased. However, with real-world diodes, large amounts of stored charge can flow from the cathode—back ...

In October 2014, the Royal Swedish Academy of Sciences issued a statement in which it said, “Incandescent light bulbs … lit the 20th century; the 21st century will be lit by LED lamps.” The occasion ...