A USB webcam is a camera that connects to a computer, usually through plugging it in to a USB port on the machine. The video is fed to the computer where a software application lets you view the pictures and also transfer them to the Internet.
How DC Motor works: The DC motor is a machine that transforms electric energy into mechanical energy in form of rotation.
Power banks work by using sophisticated electronics to manage taking in charge from a charger, storing it in a battery and then charging other devices. Power banks are not just a simple battery: they use sophisticated electronics circuitry to manage being charged, and then charging other devices.
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