Ostrich

The common ostrich is a large, flightless bird that lives in Africa. It is a record breaker in many ways; not only is it the biggest, tallest and heaviest bird,…

Chimpanzees

Chimpanzees look a little like monkeys, but chimps don’t have tails, whereas monkeys do. In fact, this is the main different between apes and monkeys. Apes are also generally bigger…

Cheetah

The cheetah is one of Africa’s most famous animals. Most people in the world are able to identify this elegant, long legged cat with its golden, spotted coat. The cheetah’s…

Blue Whale

The blue whale is a marine mammal. Its scientific name is Balaenoptera Musculus. Like all mammals, blue whales are warm-blooded, breathe air and even have some hair on their bodies!…

Blue Morpho Butterfly Facts

Blue morphos are large, brilliant blue butterflies that live in the forests of South and Central America, and also in parts of North America. Due to their striking looks and…

African Elephant

African Elephant African Elephants are the world’s largest land animal. These gentle giants can be distinguished from their Indian counterparts by their huge ears. African elephants can reach heights of…

Compact Fluorescent Lamp (CFL)

Compact Fluorescent Lamp (CFL) The compact fluorescent lamps are becoming very useful nowadays, because of consumption of power, cost, longer life, attractive look, smooth light and low maintenance. These lamps…

Fluorescent lamp

Fluorescent lamp It is a low pressure mercury vapour lamp. It consists of a glass tube 25 mm in diameter and 0.6 m, 1.2 m and 1.5 m in length.…

Mercury vapour lamp

Mercury vapour lamp On the basis of pressure inside the discharge tube, the mercury vapour lamps are classified as High pressure mercury vapour lamp and Low pressure mercury vapour lamp.…

Sodium vapour lamp

Sodium vapour lamp Sodium vapour lamps are some of the most efficient lamps in the world. They have an efficiency of up to 190 lumens per watt compared to an…

Incandescent lamp – There are two types. 1. Vacuum type lamp and 2. Gas filled type lamp

Incandescent lamp The filament of this lamp is heated up to the incandescent stage of heat. So these types of lamps are called as incandescent lamps. There are two types.…

Arc lamp and Carbon arc lamp

Arc lamp The principle of an arc lamp is that when two electrodes carrying current are separated through a small distance, an arc is struck between them. The arc lamps…

Laws of illumination – Inverse square law, Lambert’s cosine law, Light, Electrical method of producing light

Laws of illumination The illumination on a surface depends upon the luminous intensity, distance between the source and surface and the direction of rays of light. It is governed by…

Illumination – Introduction, Important terms in illumination

Introduction Almost all human activities are based on light. Natural light is obtained from the sun. Artificial light plays an important role in our everyday life. In places where natural…

Difference between Overhead line and Underground cables

Difference between Overhead line and Underground cables

Three phase cable – they are a. Belted cable up to 11 KV, b. Screened cable 22KV to 66 KV, c. Pressure cable above 66 KV

Three phase cable Commonly, underground cables are used to transmit three phase power supply. For three phase service, the following cables are used. a. Belted cable up to 11 KV…

Classification of cables – According to the rating of voltage the cables, According to insulation, cables, According to number of conductors, cables

Classification of cables a. According to the rating of voltage the cables are classified into i. Low tension cables up to 1 KV ii. High tension cable up to 11KV…

Underground cables – Underground cables Advantages of cables, Disadvantages of cables

Underground cables By using underground cable, the power is transmitted from the generating station to the consumers. When electrical power is unable to transmit by overhead lines or in a…

Power distribution system, Feeder line, Distributor, Classification of distribution system, Service lines

Power distribution system The medium voltage transformer using transmission lines are reduced by step down transformer (415V, or 240V) are used to the consumer. This system includes the feeder lines,…

Types of insulators – they are i) Pin type insulator, ii ) Suspension insulators {a. Hewlett suspension type b. Cemented cap type c. Core and link type}, iii. Strain insulator, iv. Shackle insulator, v. Stay type insulator

Types of insulators i. Pin type insulator ii. Suspension insulators a. Hewlett suspension type b. Cemented cap type c. Core and link type iii. Strain insulator iv. Shackle insulator v.…

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