Answers

2014-05-19T13:23:28+05:30
HEATERĀ  : In vacuum tubes, a hot cathode or thermionic cathode is a cathode electrode which is heated to make it emit electrons due to thermionic emission. The heating element is usually an electrical filament.ELECTRIC BULB :An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows (see Incandescence)
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2014-05-19T13:24:38+05:30
The Tungsten used as filament in heater and electric bulb.
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in heater nichrome and in electric bulb tungsten used