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 were used in the past for street lighting purposes but nowadays these are used when extreme brightness is required. Carbon arc lamp is most commonly […]
Overhead line transmission The overhead lines are used to transmit electricity from power plants to consumers. A network of electrical power lines are used to transmit the electricity over a geographic area is called power grid. Main components used in overhead lines i. Electric conductors ii. Poles and towers iii. Insulators iv. Cross arm that […]
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 following laws. 1. Inverse square law 2. Lambert’s cosine law Inverse square law It states that the illumination of a surface is inversely proportional to […]
