Refrigerator is found in almost everybody’s kitchen. It is used to store the leftover food instead of throwing it and helps to keep the things cold.
Air conditioning and refrigeration work on the same idea. It does not cool but removes the heat so that food could be kept for longer period. The gas is compressed [...]

Today almost everyone is using cell phones but do we know how it works?
Cell phone is basically the combination of two technologies or inventions. One is the telephone and other is the radio. Telephone was the invention of Graham Bell in 1876 and radio by Nikolai Tesla in 1880’s which made a way for the [...]

Speed varies from plane to plane but average speed of a plane is five hundred and eighty miles per hour.
Jet airlines can fly at the speed of 600 mph. And some others can go at the 2000 mph. It depends from aircraft to aircraft. Small jet planes can travel faster than the large passenger [...]

Gps means global positioning system. A small gadget having gps receiver tells you about your current location or where you are standing on the earth at that particular moment. Earlier people used landmarks, maps etc to save themselves from getting lost but now gps is the easiest way to know about your exact position.
Generally when [...]

Any electronic device like telephone, computer and entertainment system is made up of many different parts. If we want to create communication among these devices than we have many options like wires, radio signals, light beam, many connectors, protocols etc. and many more are coming up. These days one popular and interesting way of connecting [...]

George Carlin says “electricity is just organized lightening” or we can say that electricity always existed it was not invented instead it was discovered. It has become a very important part of today’s life. Most of the things and appliances we use run on electricity.
The credit of discovery of electricity is however given to Benjamin [...]

A box by which we see images and hear sounds is called television. Let us know about its invention and development.
In 1862 Abbe Giovanna Caselli invented pantelgraph which sends the still images with wires. May and Smith the other scientists in 1873 started their experiments with selenium and light which shows that they can convert [...]

The easiest way to contact a person is to pick up the phone, dial a number and you can have the conversation with that person even if the person is many miles away or anywhere on the earth. Nearly 100 years back you have to write a message or letter which reaches in days but [...]

Mostly all the airplanes are made up of the light and strong metal because the plane has to fly in the air and it is always tried that the weight of the plane’s body should be minimum. Its frame is mostly made up of aluminum which is a light metal. 747-8 was the last aircraft [...]

It takes nearly four minutes for a small flame to turn in a big fire. There should be smoke alarms in every house and office so that the first whiff of smoke can be detected to save the life of people.
Smoke detectors are of mainly two types one is the ionized detector and other is [...]

Laser printer works on a principle called the static electricity. A charge is built up on any object that can be a balloon, your body etc. we know that atom with opposite charge attracts each other and the objects bind with the others having atoms of opposite static electricity.
There is a drum present in the [...]

Speed trap is a device used by the officers to measure the speed of your vehicle in a particular area where speed limit is enforced. Radar or laser is used to measure the speed while speed trap is a stationary thing in itself.
The element of stealth is used in the working of a speed trap [...]

We see a light bulb with thin shield of glass but if we observe it carefully we will see a filament inside it made up of tungsten. Now let us explore how it works. Electricity is passed through the filament which is very long and thin. For 60 watt bulb the filament must be at [...]