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 Electricity Electricity has an important place in modern society. It is a controllable and convenient form of energy for a variety of uses in homes, schools, hospitals, industries and so on. What constitutes electricity? How does it flow in an electric circuit? What are the factors that control or regulate the current through an electric circuit? In this Chapter, we shall attempt to answer such questions. We shall also discuss the heating effect of electric current and its applications. ELECTRIC CURRENT AND CIRCUIT Electric current is expressed by the amount of charge flowing through a particular area in unit time. In other words, it is the rate of flow of electric charges. In circuits using metallic wires, electrons constitute the flow of charges. However, electrons were not known at the time when the phenomenon of electricity was first observed. So, electric current was considered to be the flow of positive charges and the direction of flow of positive charges was taken to be th...

  Rishikesh Rishikesh , also spelt as  Hrishikesh , is a city governed by Rishikesh Municipal Corporation (since October 2017), and a tehsil in Dehradun district of the Indian state Uttarakhand. Located in the foothills of the Himalayas in northern India, it is known as the " Gateway to the Garhwal Himalayas " and " Yoga Capital of the World ". It lies 21 km (13 mi) north of the city Haridwar and 45 km (28 mi) southeast of the state capital  Dehradun . As of 2021, Rishikesh tehsil has a total population of 322,825; this figure includes 93 surrounding villages as well as the city.  It is the seventh most populated city in the state of  Uttarakhand . It is known as the pilgrimage town and regarded as one of the holiest places for  Hindus .  Hindu sages and saints have visited Rishikesh since ancient times to meditate in search of higher knowledge. In September 2015...

 Light Light reflection occurs when a ray of light bounces off a surface and changes direction. From a detailed definition of ‘reflection of light’ to the different types of reflection and example images, our introductory article tells you everything you need to know about the reflection of light. Reflection of Light Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. Example The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool, and the water is perturbed to form waves, which disrupt the reflection by scattering the reflected light rays in all directions. Because light behaves in some ways as a wave and in other ways as if it were compos...