Systems and controls 7 min read
Electric heater
Electric heater, device for heating rooms that converts electric current to heat by means of resistors that emit radiant energy. Resistors may be composed of metal-alloy wire,…
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Lamp
Lamp, a device for producing illumination, consisting originally of a vessel containing a wick soaked in combustible material, and subsequently such other light-producing…
Systems and controls 3 min read
Electric current
Electric current, any movement of electric charge carriers, such as subatomic charged particles (e.g., electrons having negative charge, protons having positive charge), ions (atoms that have lost or gained one or…
Systems and controls 5 min read
Electricity
Electricity, phenomenon associated with stationary or moving electric charges. Electric charge is a fundamental property of matter and is borne by elementary particles.…
Systems and controls 3 min read
Control theory
Control theory, field of applied mathematics that is relevant to the control of certain physical processes and systems. Although control theory has deep connections…
Systems and controls 2 min read
Resistance
Resistance, in electricity, property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current. Resistance involves…
Systems and controls 2 min read
Feedback control
Relationship of program control and feedback control in an automated system. Machines that cannot function without (feedback) control Many basic…
Systems and controls 2 min read
Loom
Loom, machine for weaving cloth. The earliest looms date from the 5th millennium BC and consisted of bars or beams fixed in place to…
Systems and controls 6 min read
Automation
Automation, the application of machines to tasks once performed by human beings or, increasingly, to tasks that would otherwise be…
Systems and controls 11 min read
Control system
Control system means by which a variable quantity or set of variable quantities is made to conform to a prescribed norm.…