A fingerprint scanner is a type of electronic security system that uses fingerprints for biometric authentication to grant a user access to information or to approve transactions. It used to be that fingerprint scanners were mostly seen in movies and TV shows, or read about in science fiction novels.
A relay is an electromagnetic switch operated by a relatively small electric current that can turn on or off a much larger electric current.
The DC motor is a machine that transforms electric energy into mechanical energy in form of rotation.
A battery is a device consisting of one or more electrochemical cells with external connections for powering electrical devices such as flashlights, mobile phones, and electric cars.
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