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Potentiometer
Voltmeter Voltmeter, instrument that measures voltages of either direct or alternating electric current on a scale usually…
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Rheostat
Rheostat, adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit. The…
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Alternating current
Alternating current, abbreviation AC, flow of electric charge that periodically reverses. It starts, say, from zero, grows to…
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Resistor
Resistor, electrical component that opposes the flow of either direct or alternating current, employed to protect,…
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Electric heater
Electric heater, device for heating rooms that converts electric current to heat by means of resistors that emit radiant energy. Resistors may…
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Lamp
Lamp, a device for producing illumination, consisting originally of a vessel containing a wick soaked in combustible material,…
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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…
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Electricity
Electricity, phenomenon associated with stationary or moving electric charges. Electric charge is a fundamental property of matter and…
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Control theory
Control theory, field of applied mathematics that is relevant to the control of certain physical processes and systems. Although…
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Resistance
Resistance, in electricity, property of an electric circuit or part of a circuit that transforms electric energy into heat energy…