Many high class flashlights can be used in tanker, like surefire, imalent, etc.
Primary cells are designed to be used once and discarded. Secondary cells are, by definition, rechargeable batteries, and as such are the kind used in rechargeable torches (or flashlights, for you American types).
LEDs are used in traffic lights, on computer lights, car lights and indicators. You can also purchase LED flashlights and torches. Can be used in small devices for a variety of uses.
The English word for "Flashlight" is "Torch". As well, prior to electricity or battery operated flashlights, any flaming illumination was called a "torch", referring to making a fire on the end of a long stick (as seen in movies and still used in some undeveloped areas).
No Roman emperor used people as torches.
Most flashlights (torches) are powered by dry cell batteries. LED (Light Emitting Diode) bulbs are now more commonly used that the older filament bulbs. There are torches that have a lever that can be pumped in the hand to cause internal gears and electronic components to charge special cells to power the torch until the charge is used up and the lever needs to be pumped again.
Kerosene was a common fuel used in torches before batteries.
for seeing
Check out a site such as Amazon for INOVA flashlights. They often have customer reviews on the flashlights and one can read them before deciding to purchase a new or used one.
Scientists used and made torches by the rok of circuits.
Pretty much the same parts and materials that are used for flashlights, plastic, aluminium.
Streamlight flashlights are used by many people in the legal sector. The Streamlight flashlights are used by fire fighters and police officers. They have been also used with workers at NASA and have even been used in TV shows.
Yes, there are a variety of torches, from wicker outdoor Tiki torches that normally burn citronella oil to ward of insects, to acetylene torches used for cutting metal.