Jei nori gauti šį darbą, siųsk trumpąją žinutę
DOC numeriu 1398. Žinutės kaina 3 Lt.

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5 darbus gali gauti PIGIAU. Siųsk žinutę
MOK numeriu 1398. Žinutės kaina 10 Lt.

Trumpai ir aiškiai anglų kalba apie telefono aparato veikimo principą. The telephone operates on simple principles. A telephone mouthpiece contains a thin metallic coating separated from an electrode by a thin barrier (today we use plastic) which connects to a wire carrying an electric current. When a person speaks into the mouthpiece, the acoustic vibrations from her speech push the metallic coating slightly closer to the electrode, resulting in variations in voltage and therefore a speedy conversion from acoustic to electric energy.

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