A current limiting reactor is a coil which has a large inductive reactance in comparison with its ohmic resistance. It consists of a few turns of heavy copper strip, sometimes cast directly in concrete so that it can withstand large stress developed by the fault currents. Generally, the reactance of the power system under fault […]
There are two types of extrinsic semiconductors. These are n-type and p-type. In n-type, the electrons are majority charge carriers while holes are minority charge carriers. In p-type, the holes are majority charge carriers and electrons are minority charge carriers. When these two types of materials namely n-type and p-type are chemically combined with a special
A fuel cell is defined as an electrochemical device that continuously converts the chemical energy of fuel into electricity and heat without combustion. Difference between Fuel Cell and Battery: A fuel cell is similar to other electrical cells (battery) in respect that both have the positive and negative electrodes with an electrolyte between them and
Following are the most common types of fuel cell Types of Fuel Cell Important fuel cell types are described here except the alkaline fuel cell (AFC) as it is discussed earlier. Phosphoric Acid Fuel Cells (PAFC) A schematic diagram of phosphoric acid fuel cell is shown in Figure. It was developed in 1980s. It uses
Fuel cell technology is the new emerging technology. The development of this technology has started only few decades back and it is still under development for its commercial and economical use. In this article, I am going to explain the working principle of fuel cell. Working Principle of Fuel Cell A fuel cell is an
A resonance circuit consists of a capacitor and an inductor. It also has some resistance. Either this resistance may be the effective resistance of the coil itself or connected externally to create some desired effect. A resonance RLC series circuit is shown in Figure. Here, a capacitor C and an inductor L are connected
Wheatstone Bridge Working Principle Wheatstone devised a bridge-arrangement of resistances by which the resistance of a given conductor can be determined. This arrangement is called the ‘Wheatstone bridge‘. In the arrangement, four resistances are so connected as to form a parallelogram. In one diagonal of this parallelogram is connected a galvanometer and in
Dia Para Ferro Magnetic Materials Diamagnetic Materials These materials are feebly repelled by a magnet. When placed in a magnetizing field, they are feebly magnetized in a direction opposite to that of the field. Thus, the susceptibility of diamagnetic material is small and negative. Further, the flux density in a diamagnetic material placed
The logic gates are the building blocks of digital circuits. A logic gate has one output, but one or more inputs. The output signal appears only for certain combinations of input signals. There are three basic logic gates: Each logic gate is indicated by a logical symbol and its function is described either by a
A nickel-cadmium cell has two plates. The active material of the positive plate (anode) is Ni(OH)4 and the negative plate (cathode) is of cadmium (Cd) when fully charged. The electrolyte is a solution of potassium hydroxide (KOH) with a small addition of lithium hydrate which increases the capacity and life of the battery. The specific