Transcription: Each roller is attached to a wheel called an encoder. It turns along with the roller. As the encoder turns, its metal ridges touch two fixed electrical contacts. This sends an electric pulse. The faster you move the mouse, the faster you generate the pulses. The signals from both roller encoders are sent to the mouse's circuitry. By counting the pulses and their frequency, the mouse learns how much you've moved it. Smart mouse! The mouse sends these signals through a cable. its tail, along with any electrical signals created when you press the buttons on the mouse. The electrical signals trave ...
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