The light bulb was invented by Thomas Edison in 1879 however there had been many earlier attempts at creating the light bulb many of which heavily contributed to Edison's final invention, most notably the arc lamp. The arc Lamp was used to light London's streets up until the 1950's as it was found to be too bright for homes and was replaced by more economically friendly bulbs as it only had a short lifespan. Before Edison invented the light bulb the most common source of light was either by candle, oil or paraffin lamps which where often dangerous due to the need to be cleaned regularly to maintain safe usage and often produced a smell due to the burning processes.
The most commonly found bulb is the incandescent bulb which has a a filament sometimes made from tungsten, that glows when an electric current passes through allowing light to be cast in all directions. However there are other less common types of bulb such as LED (light emitting diode) and florescent lighting. LEDs are common as they are more energy efficient than incandescent bulbs however are often not as bright. Florescent bulbs are also common in commercial lighting and outdoor lighting as they come in a wide variety of sizes and colours making them more adaptable for commercial use rather than in homes.
Electric Circuits:
The most simple electrical circuits are those which feature a power source or battery, a switch, conductor and a resistor which will convert electric current into another form of energy. In the case of a light bulb electric current flows through the bulb and is converted into light as well as wasted energy in the form of heat. The conductor is used to connect the positive energy source the resistor and connects the circuit to the negative side of the power source.
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