Vacuum Cleaners Vacuum cleaners are a common household appliance used for cleaning most surfaces. On the outside they comprise of a rectangular or oval body with a piece of flexible hose at one end connected to a snout used for sucking up dust. Inside the main body of a vacuum cleaner is a fan attached to a powerful motor. When switched on, this fan begins to suck in air through the...

Television The modern television was made possible as a result of the developments in electronics in the twentieth century and it was largely developed by a Hungarian scientist called V.K.Zworykin between the years 1923 and 1939. The television set we have in our houses is basically a receiving unit for the images which are captured and transmitted by the T.V. Camera. The T.V. Camera sends the light from an image to...

Ballpoint Pens As the name suggests the tip of a ballpoint pen contains a small ball made of iron or other material which leaves a trail of ink as we write with it. A ballpoint pen has three parts i.e. the outer cover or shell made of metal or plastic, the inner reservoir of ink, containing a thick, gelatinous and quick drying ink, and the tip or point which houses the...

Taps and Faucets     Water is a necessity of life and we cannot do without it, however the supply of purified water for human consumption or use is not unlimited thus we need to regulate it. This regulation is carried out with the help of a device called a Tap or Faucet. This device is fixed on to a water pipes and is made of a handle or knob at...

The Light Bulb Life would not be possible on the Earth without light. In the daytime the Sun provides us with it and after sunset, the light comes out of a device commonly known as the light bulb. The light bulb is made of a metal base which houses a glass support through which pass two pieces of metal wire, these are joined together at the top with a tiny spiral...

Rockets It is the age of the rockets today and it all began way back in China about 800 years ago, the Chinese used them initially as fireworks and then for war. Rockets first came to Europe and India in the middle of the thirteenth century. They were primarily used for war as a replacement for burning arrows, or for signalling. In the beginning of the nineteenth century a contingent of...

Petroleum   Oil is pumped out of holes drilled in the ground, both on land and in the seas, and the unpurified oil is called Petroleum. With the advent of the industrial revolution in Europe, there arose a need for a better fuel to run engines and light the lamps. In America a man called George Bissell first thought of drilling oil from the ground. He extracted and sent a sample...

Electricity “Life without electricity! impossible.” yes it is true. Today most things are not possible without electricity, for that matter this book could not have been printed without it either. We owe it to Alessandro Volta who, in the year 1800, invented the first battery which made possible the providing of a continuous electrical current. In those days there were various machines which provided electricity in surges but not a continuous...