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Hunting and gathering societies generate a productive surplus.
Normally-Open
A contact configuration in switches or relays that is open (non-conducting) when at rest, closing only when activated.
Contactor
An electrically controlled switch used for switching an electrical power circuit, commonly used in motor control applications.
Start Pushbutton
A button that, when pressed, initiates the operation of a machine or device, commonly found in motor control circuits to start motors.
Control Circuit
An electrical circuit designed to control the operation of devices in a system, often through the use of relays, switches, and timers.
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