Alternating current
Alternating current, abbreviation AC, flow of electric charge that periodically reverses. It starts, say, from zero, grows to…
Systems and controls
Systems and controls
Resistor
Resistor, electrical component that opposes the flow of either direct or alternating current, employed to protect,…
Systems and controls
Electric heater
Electric heater, device for heating rooms that converts electric current to heat by means of resistors that emit radiant energy. Resistors may…
Systems and controls
Lamp
Lamp, a device for producing illumination, consisting originally of a vessel containing a wick soaked in combustible material,…
Systems and controls
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…
Systems and controls
Electricity
Electricity, phenomenon associated with stationary or moving electric charges. Electric charge is a fundamental property of matter and…
Systems and controls
Control theory
Control theory, field of applied mathematics that is relevant to the control of certain physical processes and systems. Although…
Systems and controls
Resistance
Resistance, in electricity, property of an electric circuit or part of a circuit that transforms electric energy into heat energy…
Systems and controls
Feedback control
Relationship of program control and feedback control in an automated system. Machines that cannot function…
Systems and controls
Loom
Loom, machine for weaving cloth. The earliest looms date from the 5th millennium BC and consisted of bars or…