Tashkent state technical university named after I. Karimov almalyk branch faculty of

Piezoelectricity — Electric polarization in a substance (especially certain crystals) resulting from the application of mechanical stress (pressure).
Polarity — A collective term applied to the positive (+) and negative ( - ) ends of a magnet or electrical mechanism such as a coil or battery.


Power — The rate at which electrical energy is transferred by an electric circuit. Measured in Watts.

Power Factor — The ratio of the actual electrical power dissipated by an AC circuit to the product of the r.m.s. values of current and voltage. The difference between the two is caused by reactance in the circuit and represents power that does no useful work.

Protective Relay — A relay device designed to trip a circuit breaker when a fault is detected.


Reactive Power — The portion of electricity that establishes and sustains the electric and magnetic fields of AC equipment. Exists in an AC circuit when the current and voltage are not in phase. Measured in VARS.

Relay — An electrical coil switch that uses a small current to control a much larger current.

Reluctance — The resistance that a magnetic circuit offers to lines of force in a magnetic field.