A flashlight, which is called a torch in British Commonwealth countries, is a hand-held portable electric device which generates light. A conventional flashlight consists of an electric battery and incandescent light bulb.
With changes in technology and the rise of the age of semiconductors, flashlights also shifted from conventional light bulbs towards the use of LEDs. LEDs are light-emitting diodes (LEDs). By using proper material, these diodes can create lights of various colors.
More: continued here
No comments:
Post a Comment