How will the thermionic current vary if the filament current is increased?

Thermionic current will increase if the filament current is increased as due to increase in temperature in filament. It is due to internal resistance through which the temperature of filament increases. This increase in temperature will give enough kinetic energy to electrons to leave the surface of filament and it will lead to increase in number of thermions number leaving per unit surface area of filament and hence thermionic current will increase.


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