In this lesson we'll introduce the control relay, an electromechanical device that forms the principal logical element of an electrically controlled system. Relays can perform numerous functions by selectively energizing or deenergizing other elements within the system or between two separate systems at the appropriate moments to coordinate and sequence activity.

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For more FREE online technical training check out the following playlists available at the bigbadtech channel:

DC Circuit Analysis [ Ссылка ]

Single Phase AC Circuit Analysis [ Ссылка ]

3 Phase AC Circuit Analysis [ Ссылка ]

Hydraulics [ Ссылка ]

Pneumatics [ Ссылка ]

Motor Control [ Ссылка ]

Motors and Generators [ Ссылка ]

Motor Drives/Variable Frequency Drives (VFD) [ Ссылка ]

Programmable Logic Controllers (PLCs) [ Ссылка ]

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