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The form of energy commonly used in the working of a TV remote is infrared (IR) radiation .
TV remotes use infrared (IR) light, a type of electromagnetic radiation (EMR), to communicate with TVs. When a button on the remote is pressed, the transmitter, or remote, emits a series of infrared light pulses that form a pattern unique to that button. The receiver, or TV, recognizes the pattern and responds accordingly.
The remote emits the signal by turning the light on and off, with the time between flashes indicating whether a 0 or 1 is being sent. For example, the code for “turn up the volume” might be a series of light flashes for volume up, followed by a code for the type of TV.
IR.
IR light is invisible to the human eye, but can be seen with a digital camera, video camera, or phone camera. The wavelength of IR waves ranges from 700 nanometers to 1 millimeter.