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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Uses of infrared radiation. We cannot see infrared radiation, but we can feel it as heat energy. Infrared sensors can detect heat from the body. They are used in: security lights; burglar alarms; Infrared radiation is also used to transmit information from place to place, including: remote controls for television sets and DVD player