Electric Motor Electric motor is a device that converts electric energy to mechanical energy and is used as an important component in electric fans, washing machines etc. Principle of Working of an Electric Motor The electric motor works on the principl…

Electromagnetic Induction In 1831, Faraday made an important breakthrough by discovering how a moving magnet ran be used to generate electric currents. The phenomenon of inducing current in a coil by a changing magnetic field is called electromagnetic i…

Electric Generator An electric generator works on the principle of electromagnetic induction. When an armature is rotated in a magnetic field, an electric current is induced in the coil. Here, mechanical energy is used to rotate a conductor in a magneti…

Good Sources of Energy Energy comes in different forms and one form can be converted to another. Energy, in the usable form, is dissipated to the surroundings in less usable forms. Hence, any source of energy we use, to do work, is consumed and cannot b…

Conventional Sources of Energy The global demand for energy has increased over the years due to rapid industrialization. It was met largely by the fossil fuels – coal and petroleum. But these are non-renewable and hence will get exhausted if consumed at…

Alternative Or Non-Conventional Sources of Energy We need to exploit new sources of energy and also develop technology to use the known sources of energy more efficiently due to the increasing demand for energy. Solar Energy The energy obtained from the…

Environmental Consequences The energy source we choose would depend upon on the following factors: The ease of extracting energy from that source. The economics of extracting energy from the source. The efficiency of technology available. The environme…

Ecosystem The environment includes our physical surroundings like air, water, soil and all the organisms such as plants, animals, human beings and micro-organisms like bacteria and fungi (called decomposers). An ecosystem is a self-contained unit of liv…

Food Chains and Food Webs Food or energy can be transferred from one organism to the other by means of food chains. All the food chains begin with the autotrophs as they are the producers of food. Food chain is therefore the sequence of living organisms…

Effect of Our Activities on Environment Since we are an integral part of the environment, our activities also change the environment around us. Ozone Layer and its Depletion Ozone (O3) is a deadly poisonous gas that is formed by three atoms of oxygen. I…