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A mechanically powered flashlight (UK: mechanically powered torch) is a flashlight that is powered by electricity generated by the muscle power of the user, so it does not need replacement of batteries, or recharging from an electrical source. There are several types which use different operating mechanisms.
Light can be used to transmit data and analog signals. For example, lighting white LEDs can be used in systems assisting people to navigate in closed spaces while searching necessary rooms or objects. [100] Assistive listening devices in many theaters and similar spaces use arrays of infrared LEDs to send sound to listeners' receivers.
A set of lighting cues are prepared so that the lighting operator can control the lights in step with the performance; complex theatre lighting systems use computer control of lighting instruments. Motion picture and television production use many of the same tools and methods of stage lighting.
Remote keyless entry fob for a car. Keyless entry system – a short-range handheld battery powered key fob transmitter, included with most modern cars, which can lock and unlock the doors of a vehicle from outside, eliminating the need to use a key. When a button is pressed, the transmitter sends a coded radio signal to a receiver in the ...
The top of a power pole Power & Energy engineering deals with the generation , transmission , and distribution of electricity as well as the design of a range of related devices. [ 59 ] These include transformers , electric generators , electric motors , high voltage engineering, and power electronics .
A firepole in Cologne with a door at the entry. Losing one's grip on the pole can result in falling from a great height; the firefighter may hit an object such as a door extending from a truck; poor speed control can result in injured or even broken legs upon impact with the floor; and burns can occur due to friction if the skin rubs against ...