1 - Case The tube that houses the parts of the flashlight, including the batteries and lamp (light bulb). 2 - Contacts A very thin spring or strip of metal (usually copper or brass) that is located throughout the flashlight, making the electrical connection between the various parts â the batteries, the lamp, and the switch.
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An infrared heater or heat lamp is a body with a higher temperature which transfers energy to a body with a lower temperature through electromagnetic radiation. Depending on the temperature of the emitting body, the wavelength of the peak of the infrared radiation ranges from 6993780000000000000â 780 nm to 1 mm.No contact or medium between the two bodies is needed for the energy transfer. Infrared heaters can be operated in vacuum or atmosphere.nfrared heaters are usually classified by the wavelength they emit. Near infrared (NIR) or short-wave infrared heaters operate at high filament temperatures above 7003207315000000000â 1800 Â°C and when arranged in a field reach high power densities of some hundreds of kW/m 2.