What is Light?

Light that is seen by the human eye is a term used to describe electromagnetic radiation. From low energy waves to high energy ones, the entire electromagnetic spectrum is incredibly vast.

Many of the features of a substance may be understood by examining light that has originated from or interacted with that substance since light can be transformed when it interacts with a substance.

Speed of Light

The speed of light devoid of matter is defined to be exactly 299,792,458 meters per second.

Study of Light

Research on how light interacts with any object that takes up space (matter).

History of Lights

From harnessing the power of light and putting it in light bulbs, lamps, flashlights, and more.

Commercial Availability

Thomas Edison started working seriously on creating a useful incandescent lamp in 1878, and within the year, he submitted his first patent application for electric lights. He continued to test several metal filament materials to refine his initial design later on.

Prior to electricity and the incandescent light bulb there were natural lighting, torches, candles, oil lamps, and gas lights. Lamps were originally created a few thousand years ao where a rock was made hollow and an absorbent substance was put inside and ignited.

All types of light has been utilized in architecture. One of the most known building with the oldest form of light, natural light, is the Pantheon in Rome, Italy. The hole at the top of the building provides light to enter the building in a very unique way.

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Types of Electricity

Electrons are moving constantly in current electricity. Direct current (DC) and alternating current (AC) are the two types of current used in electricity (AC). Electrons travel only in the direction of direct current. Direct current is produced by batteries. Electrons move in both directions during alternating current. Electric current produced by power stations is AC.


AC stands for alternating current power. It is the type of electricity that comes out of power outlets.


DC power stands for direct current. It is usually found in batteries and fuel cells. AC is usually converted to DC.