Telecommunication 6 min read
Telecommunication
Telecommunication, science and practice of transmitting information by electromagnetic means. Modern telecommunication centres on the problems involved in transmitting large volumes of…
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Systems and controls 2 min read
Other methods of machining
Ultrasonic machining (USM) In USM, material is removed from a workpiece with particles of abrasive that vibrate at high frequency in a…
Systems and controls 4 min read
Electrical-discharge machining (EDM)
EDM involves the direction of high-frequency electrical spark discharges from a graphite or soft metal tool, which serves as an electrode,…
Systems and controls 6 min read
Adaptive control
Improvements in CNC machine tools depend on the refinement of adaptive control, which is the automatic monitoring and adjustment of machining conditions…
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…
Systems and controls 3 min read
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,…
