The light bulb, invented in 1879, by Thomas Alva Edison, has a prominent place in our homes and lives. It is a simple machine that works on the principle of resistance. The light bulb is better known as the incandescent lamp for its illuminating properties. It makes use of a thin filament, usually made of tungsten. Tungsten is a natural element, known to have the highest degree of resistance. Electricity, when passed through the tungsten wire, heats it up and converts the electricity to light. Artificial light is provided by incandescent lamps, tube lights, candles, torches and solar lamps. Our planet's natural source of light and energy is the sun. The most common source of artificial light is the light bulb.
Light bulbs are powered by electricity. There are variants of the light bulbs. One makes use of a battery to function. Most of these battery-operated bulbs are used as a backup light source when there are power failures. In case of floods, earthquakes, power grid failures and other natural catastrophes, communication lines and power supply gets affected. At these times, having an emergency light bulb comes handy. An emergency light bulb makes use of a battery, a light bulb, a trip switch, an on and off switch and a charging cord. When there is a power failure, the emergency light discontinues charging and comes on automatically. This makes it possible to illuminate the areas. Emergency light bulbs are found in homes, hospitals, schools, churches and other public places. They are easily available in many sizes, in accordance to the area that needs to be illuminated.
Emergency light bulbs have been an integral part of rescue units. They were exceptionally handy while rescuing victims from the debris of the World trade Center and during the rescue operations post- hurricane Katrina.
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