Components of electric circuits. The infinitive

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hemical energy. (To convert electric energy into thermal, mechanical or chemical energy is the main function of loads. )
6) Electric power is delivered from power sources to loads by electric wires. (To deliver electric power from power sources to loads is the main function of electric wires. )

1) Аудирование текста
Incandescent light bulb.
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Incandescent light bulb
Humphry Davy, an English scientist, made the first incandescent electric lamp in 1800. He experimented with electricity and invented an electric battery. When he connected wires to his battery and a piece of carbon, the carbon glowed, producing light. This is called an electric arc.
Much later, in 1860, the English physicist Sir Joseph Wilson Swan made a practical, long-lasting electric light. He found that a carbon paper filament worked well, but burned up quickly. In 1878, he demonstrated his new electric lamps in Newcastle.
The inventor Thomas Alva Edison (in the USA) experimented with different filaments to find just the right materials to glow well and be long-lasting. In 1879, Edison discovered that a carbon filament in an oxygen-free bulb glowed but didnt burn up for 40 hours. Edison eventually produced a bulb that could glow for over 1500 hours.
In 1903, Willis R. Whitney invented a treatment for the filament so that it wouldnt darken the inside of the bulb as it glowed. In 1910 , William David Coolidge invented a tungsten filament, which lasted longer than the older filaments. The Incandescent bulb revolutionized the world.
Incandescent lamp - лампа накаливания
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