Characteristics of PN junction diode is a graph between the voltage applied across its terminals and the current that flows through it. It is drawn to know the behavior of diode in the electrical circuit. For a typical junction diode, characteristics are shown in Figure. It shows how much current will flow for a particular […]
Zener diode is a crystal diode having unusual reverse current characteristics which are particularly suitable for voltage regulating purposes. When a reverse voltage applied to a zener diode is increased, a value is reached at which the current increases greatly from its normal reverse value. This voltage is known as zener voltage (Vz) or
Hi friends, in this article, I am going to describe the working principle of rectifier, if you are interested, keep reading. Electric energy is available in homes and industries in the form of alternating voltage. But for the operation of most of the devices in electronic equipment, a DC voltage is required. Therefore almost all
Auto transformer starters are used generally with AC squirrel cage motors having a power rating of more than 20 HP. Motors of these power ratings draw excessive starting current with the use of Star/Delta starter. This may cause excessive strain on the motor and creates an intense voltage dip. This can prove harmful for the motor
A lead-acid battery is the most inexpensive battery and is widely used for commercial purposes. It consists of a number of lead-acid cells connected in series, parallel or series-parallel combination. A lead-acid cell basically contains two plates immersed in electrolyte (dilute sulphuric acid i.e. H2SO4 of specific gravity about 1.28). The positive plate (anode) is
Hi friends, in this article, I am discussing about analog frequency meter working principle and hope you will find it informative and helpful. The action of moving iron analog frequency meter depends on the variation in current drawn by two parallel circuits – one inductive and the other non-inductive – when the frequency changes.
Hi friends, in this article, I am going to describe the significance of vector group of transformer. It is very essential information for parallel operation of transformers and is very interesting as well. Connection of transformer windings can be made in a number of ways. Accordingly, different types of connections have been standardized depending upon
Hi friends, in this article, I am going to discuss the polarity of transformer windings, if you are interested, keep reading. Unlike DC system, there are no fixed positive and negative poles in AC system, and hence, transformers cannot have fixed positive and negative terminals. The relative direction in which primary and secondary windings of a
The following connection schemes of the power distribution system are generally employed: Radial Distribution System In a radial distribution system, separate feeders radiate from a single sub-station and feed the distributors at one end only. A single-line diagram of a radial system for AC distribution is shown in the figure. Here substation supplies power to
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The distributors of AC and DC distribution system are generally classified as per the way they are being fed by the feeders. The main distributor types in power system are as under: Distributor Fed at One End In this type, the distributor is connected to supply at one end and loads are tapped at different