Interesting Science

      Motors and generators are electrical machines, which are used to do some useful work. These machines use electrical energy to operate and produce power. There are generally two types of machines namely DC (Direct Current) machines and AC (Alternating Current) machines. Here the DC machines (DC motor and DC generator) use, a DC Supply to power it up, whereas an AC machine (AC motor and AC generator) uses an AC supply to power it up. A motor uses electrical energy to produce mechanical energy, whereas a generator uses mechanical energy to produce electrical energy. Even though the relation between both the motor and the generator are opposite to each other, they are much more similar in construction and operation. In this article let’s look at the construction and operation of these machines. Credit (DC Motor):  By Dcaldero8983 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=17240288 Credit (DC Generator):  By Biswarup Gang...

       Electrical energy is one of the most powerful sources that powers and lights up our world today. Today electrical energy has been transmitted and delivered to every corner of the world. Most of the equipment and home appliances operate on electrical energy. The best example of an electrical appliance is the incandescent bulb which was invented by the great scientist Thomas Alva Edison.      The journey of electrical energy is an amazing process. The electrical energy is generated at one place, and it is transmitted to very distant places for several miles. Let’s look at the journey.    At first, the electricity is generated in power stations. These power stations are located only at specific places according to the raw materials available and due to several other factors. Here the electricity is generated in large amounts by using huge alternators. An alternator is a machine that is rotated by some source to generate power. T...

     Our Earth is a beautiful home for all living beings. It gives us shelter and even protects us from various cosmic activities. One of the best protections that our earth provides us is protecting us from the harmful solar wind by using its strong magnetic field. This means the earth itself acts like a giant bar magnet thereby producing and stretching its magnetic field outer into space. The magnetic field present in outer space is called the magnetosphere. The magnetic field extends up to tens of thousands of kilometers into space. For example, the magnetic field of Jupiter extends up to the orbit of Saturn.       First of all, let’s see the orientation of the magnetic field over the Earth. The top portion of the earth is always called as the G eographic North Pole and the down portion of the earth is called as the G eographic South Pole. But the imaginary magnet present inside the earth always faces its north magnetic pole in the geo...

         The eye is the most vital organ in the human body. It enables us to see things and observe them. The operation of the human eye is an impressive operation. The light reflected from an object enters our eyes through the cornea. The cornea refracts the light and focuses on the lens. The lens again refracts the light and focuses the image on the retina. The image appearing on the retina will always be upside down. The fallen reversed image is then converted into electrical impulses and transmitted to the brain through the optic nerve. Our brain corrects the reversed image into a correct orientation. That’s how we see an image.   Credit (Human Eye Anatomy):  courses.lumenlearning.com      Due to certain conditions, our eyes get subjected to certain problems. The most common problems that occur in the eye are myopia, hyperopia, and astigmatism. Myopia also called as short-sightedness, is when the person can only see the object...

        A coral is a group of tiny animals called polyps living under the water. It is often seen as colorful rocks under the ocean. But actually, these are tiny animals that sit on a rigid rock made up of calcium carbonate. These rocks are called the skeletons of polyps. These corals make their whole life over there. Over time, the corals get to multiply and cause a major reef called a coral reef. As we know, the largest coral reef in the world is the Great Barrier Reef in Queensland, Australia. The corals evolved in the world some 450 million years ago, whereas humans evolved in the world only 7 million years ago. Coral Reef     The coral reef provides us various advantages. It protects us from natural disasters like tsunamis by buffering the ocean waves. It also acts as a home for millions of species in the ocean. Apart from these advantages, most of the human population on the seaside depends largely on the coral reef for food and m...