Dry Cell - A metal container filled with a paste made up of chemicals that procedure electricity.
Electron - Tiny particle that carries a minus particle of electricity.
Circuit - The round-trip path from a source of electric current, through wires, and back to the source.
Volt - Unit for measuring the push of an electric current.
Watt - Unit for measuring electrical power.
We have been told that magic has no place in science. But if Benjamin Franklin could see some of the modern uses of electricity, he might say, "It uses be magic!".
Just think how you use electricity today. Were you been awakened by an electric alarm clock? Did your father shave with an electric razor? Did your mother make wraffles on electric waffle iron?
Did you watch telivision before going to school? Did you ever stop to wonder what makes your door chimes and telephone work?
Were the lights on in your classroom? Did your principal speak to school over the loudspeaker? Did you see a movie or a filmstrip in class?
Think of all the other things in the world electricity makes work, and will see why anyone might use the word "magic" for it.
A magic trick, however , cannot usually repeated successfully at home but many specific experiments can be carried out by anyone. In fact, it isn't always necessary to have a great deal of equipment. Much of it can be homemade.
So let's forget the word "magic" and replace it with "understanding" and "knowledge".
When a scientist is puzzled by something, he tries to find the answers by doing several things. He observes whatever puzzles him very carefully. He then writes down what he sees. Then he studies the information to see of he can see the idea about it. He calls the idea a theory. Next he experiment to prove whether or not the theory is correct.
Scientist have theory about what electricity is. to understand this theory, we must begin with another theory.
Every object can think of is made up of molecules, the smallest particle into which anything can be divided and still keep its original qualities. If we break up a molecule, we have atoms, which are much smaller particles. For instance, water (liquid) is made up of two atoms of hydrogen and one of oxygen (both gases until they combine from water). If we break down the water molecule, the hydrogen and oxygen to their original state as gases.
All things in thw world are made up of combinations about 100 atoms. That is why they called atoms "buildning blocks" of the universe.
Atoms, themselves, are composed of still smaller particles called electrons, protons,neutrons, and several others.
Scientist tell us that electricity is made up of electrons, each of them carying a small electric charge. When we get this electrons to move, we have an electric current-electricity.
We make these electrons move by using big machines called generators, which produce electricity. Energy to some generators comes from burning coal or oil. In some places near rivers, some of the river water is made to fall through a slots in a dam. The falling water strikes larges wheels that have spokes made of metal blades attached to a central rod, or axle. The axle spins fast, making the generator run and produce electricity.
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