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Author Archives: admin

what does Equilibrium mean

What is equilibrium? “A body is said to be in equilibrium if no net force acts on it.”Newton’s first law of motion tells us that a body continues its state of rest or of uniform motion in a straight line if no resultant or net force acts on it.For example,a book lying on a table or a picture hanging on ...

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Work power energy formulas

What is work? “Work is said to be done when a force acts on a body and moves it in the direction of the force.”Generally ,it refers to perform some task or job.In science ,work has precise meaning.For example,a man carrying a load is doing work but he is not doing work if he is not moving while keeping the ...

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alternative renewable energy

What is solar energy? “Solar energy is the energy coming from the sun and is used directly and indirectly.”The earth receives huge amount of energy directly from the sun each day.Solar energy at normal incidence outside the earth’s atmosphere is about 1.4 kWm-2 which is referred as solar constant.While passing through the atmosphere,the total energy is reduced due to reflection,scattering ...

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n type and p type semiconductor

In terms of their electrical properties,materials can be classified into three groups: Conductors Insulators Semiconductors When atoms combine to form a solid,crystalline materials,they arrange themselves in symmetrical pattern.The atoms within crystal structure are held together by covalent bonds,which are created by the interaction of the valence electrons of the atoms. Silicon is a crystalline material.All materials are made up of ...

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Electrical and magnetic properties of solids

What are Solids? Material have specific used depending upon their characteristics and properties, such as hardness, ductility,malleability, conducting or magnetic etc. What makes steel hard, lead soft, iron magnetic and copper electrically conducting? It depends upon the structure- the particular order and bonding of atoms in a material. this clue has made it possible to design and create materials with ...

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What is an electrical Transformer

What is transformer? “A transformer is an electrical device to change a given alternating emf into a larger or smaller alternating emf.”or “It is a static or stationary piece of apparatus that transfers electric power from one circuit to another having mutual inductance without changing the frequency.”A basic transformer is an electrical device constructed of two coils placed in close ...

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Satellite

 What is satellite? Any heavenly body that moves around a planet s called a satellite. The Moon is a natural satellite of the Earth that orbits the Earth. Mars, Jupiter,Saturn,Uranus and Neptune have their own satellites too. Natural Satellites: Beside moons of the planets, some other natural satellites are also moving around the Sun. These are asteroids, comets and meteoroids. ...

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Space

 Space exploration: “Scientific study of the space using especially developed technology is called space exploration.”Do you know that all stars,the sun,the Moon,the earth,all planets and satellites are called heavenly bodies?The heavenly bodies are moving in unimaginable vast space universe. The sun,the planets,and their moons are the largest objects in the solar system.But asteroids and comets are the smaller parts of ...

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Star

What are stars? On the clear night we can see a cloudy band that stretches North to South across the sky.in fact we are seeing part of our own galaxy,the Milky way.there countless stars in our galaxy. We cannot see our galaxy as a whole, but scientists can see many other galaxies in the sky. We see many twinkling lights ...

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Newton’s law of universal gravitation

What is Gravitation? Gravitation or gravity is defined as: “The force of attraction between any two objects in the universe.” History: From at least the time of the ancient Greeks,two problems were the subjects of searching inquiry: The tendency of objects such as stones to  fall to earth when released. The motions of the planets,including the sun and the moon,which ...

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