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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