Draw anode current-diode voltage curves of a thermionic diode for two different filament currents and explain their main features. 

Draw anode current-diode voltage curves of a thermionic diode for two different filament currents and explain their main features.

The current increases with the positive anode potential as far as the point S. Beyond this point the current does not increase, because the anode is collecting all the electrons emitted by the filament ; the current is said to be saturated.

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