Permanent magnet dc motors employ a permanent magnet instead of stationary field winding (as with the case of some other…
Sensors are normally used to convert physical variables like pressure to signal variables. Sensors are also often termed to as…
Laser diodes are PN junction devices under a forward bias. LASER is an acronym for Light Amplification by Stimulated Emission…
Light emitting PN junction devices such as LEDs and laser diodes are easily modulated by superimposing signals on to the…
Testing is usually performed on DC machines to establish efficiency and power losses. A brake test is a direct technique…
The greater part of the substations in the power systems are focused on changing of the voltage level of the…
A photoelectric effect is any effect in which light energy is converted to electricity. When light strikes certain light-sensitive materials,…
A substation can be defined as an assembly of apparatus used to change some characteristics like voltage, AC, DC, frequency,…
Let us consider an inductive load taking a lagging current I at a power factor cosΦ1. For us to improve…
Solid-state soft starting is the most commonly used technique for starting induction motors. It provides a smooth build-up of current…
