Systems and controls 3 min read
Frequency response
Hearing aid Hearing aid, device that increases the loudness of sounds in the ear of the wearer. The earliest aid was the…
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Damping
Damping, in physics, restraining of vibratory motion, such as mechanical oscillations, noise, and alternating electric currents, by dissipation of energy. Unless a child keeps pumping a…
Systems and controls 3 min read
Servomechanism
Servomechanism, automatic device used to correct the performance of a mechanism by means of an error-sensing feedback. The term servomechanism…
Systems and controls 7 min read
Superconductivity
Superconductivity, complete disappearance of electrical resistance in various solids when they are cooled below a characteristic temperature. This temperature, called the transition temperature,…
Systems and controls 4 min read
Electromotive force
Electromotive force, abbreviation E or emf, energy per unit electric charge that is imparted by an energy source, such as an electric generator or a battery. Energy is converted from…
Systems and controls 2 min read
Potentiometer
Voltmeter Voltmeter, instrument that measures voltages of either direct or alternating electric current on a scale usually graduated in volts, millivolts (0.001…
Systems and controls 1 min read
Rheostat
Rheostat, adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit. The rheostat can adjust generator characteristics,…
Systems and controls 2 min read
Alternating current
Alternating current, abbreviation AC, flow of electric charge that periodically reverses. It starts, say, from zero, grows to a maximum, decreases to zero,…
Systems and controls 1 min read
Resistor
Resistor, electrical component that opposes the flow of either direct or alternating current, employed to protect, operate, or control the circuit. Voltages…
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,…
Systems and controls 7 min read
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…