Electrical4U 
A shunt reactor is defined as a device that absorbs reactive power from a power system to help regulate voltage levels. They are commonly used in high-voltage transmission lines and substations to offset the capacitive effects of long cables and overhead lines. Shunt reactors can be fixed or variable, depending on the needed voltage regulation. … Read more
Secondary electron emission occurs when an incident electron, ion or other energetic particle strikes a material and electrons leave the surface. The incident particle is the primary. Emitted low-energy electrons created by inelastic interactions are true secondary electrons. Measurements may also include elastically backscattered and rediffused primary electrons, so the reported yield must state which … Read more
What is Alternating Current? An alternating current (AC) is an electric current whose direction and magnitude change periodically, where direct current (DC) keeps one direction. That reversal lets transformers raise and lower voltage cheaply, which is why AC moves bulk power across long distances with less loss. Most household appliances draw AC from a wall … Read more
A MOSFET, a metal-oxide-semiconductor field-effect transistor, controls current flow with an electric field. High switching speed, low power consumption, high input impedance and efficiency make MOSFETs central to electronics and power applications, from switching circuits to amplifiers. What is a MOSFET? A MOSFET consists of three terminals: gate, source and drain. The gate is separated … Read more
A servo motor is designed for controlled motion as part of a closed-loop axis. The complete axis includes a motor, power drive, controller, sensor, mechanics and load. It can regulate rotary position, velocity or torque. Linear position control needs a linear motor or a mechanical transmission that converts rotation to translation. Servo systems are common … Read more
What is a Keyboard Encoder? A keyboard encoder is a device that converts the signals from a keyboard matrix into a serial format data word that can be transmitted to an external device, such as a computer or a microcontroller. A keyboard matrix is a grid of rows and columns of switches that represent the … Read more
A capacitor bank combines power-capacitor units in series and parallel to meet the voltage, reactive-power and protection needs of an AC power system. Each unit stores energy in an electric field. Capacitor banks can supply capacitive reactive current for power factor correction, support local voltage and form part of a designed harmonic filter. Series banks … Read more
A dry type transformer uses no liquid as the main insulation or cooling medium around its windings and core. Solid insulation and surrounding air provide dielectric separation and remove heat. Units may be ventilated, non-ventilated or sealed. A pressurised gas tank is a separate sealed construction, not a defining feature of every dry-type transformer. Dry … Read more
A power transformer transfers power between windings through electromagnetic induction. It normally changes voltage and alternating current while the input and output have the same frequency. Step-up units enable efficient bulk transmission; step-down units supply lower-voltage networks and loads. Every real transformer has core, winding and stray losses, so output power is lower than input … Read more
A diesel power plant is a generating station that uses a diesel engine as its prime mover to drive an alternator and produce electricity. Quick starting and modest civil works make it a common choice for small-scale generation, remote-area supply and emergency or standby power. What is a Diesel Power Plant? In plant terms, a … Read more