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james		 How is amplification carried out in the elcetrical and electronic devices ?? View All


3 months ago - 9 months left to answer. - 1 response - Report Abuse
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richie
 Energy is neither created nor destroyed (as you mention). In a vacuum tube radio, etc. the incoming signal is very weak (although it can be heard with a crystal radio set) and must be amplified to drive the radio's speaker(s). The vacuum tube provides a potential source of electron current from a hot filament (that boils off electrons) to a collector plate and the weak transmission signal is introduced to a grid between the filament and plate acting as a gate to control a substantial flow of electrical current (hence amplification). In fact the British call vacuum tubes valves (and the weak signal acts as a valve to control electron flow from a battery or house current). Similar control can be obtained using semiconductors.

3 months ago

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