JEE Main & Advanced Physics Semiconducting Devices Diode Valve

Diode Valve

Category : JEE Main & Advanced

(1) Inventor : Fleming

(2) Principle : Thermionic emission

(3) Number of electrodes : Two

(4) Working : When plate potential $({{V}_{p}})$ is positive, plate current$({{i}_{p}})$ flows in the circuit (because some emitted  electrons reaches to plate). If $+{{V}_{p}}$ increases ${{i}_{p}}$ also increases and finally becomes maximum (saturation).

(5) Space charge : If ${{V}_{p}}$is zero or negative, then electrons collect around the plate as a cloud which is called space charge. space charge decreases the emission of electrons from the cathode.

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